soy milk

{{short description|Beverage made from soybeans}}

{{Citation style|date=July 2023}}

{{Use dmy dates|date=August 2021}}

{{Infobox food

| name = Soy milk

| image = 004-soymilk.jpg

| caption =

| alternate_name = Soya milk

| country = China

| year = {{abbr|a|before}}.{{nbsp}}1365{{sfnp|Shurtleff|Aoyagi|2013|pp=5 & 23–4}}{{sfnp|Shurtleff|Aoyagi|2014|pp=9 & 127}}

| variations =

| serving_size = 100 g

| calories = 33

| protein = 2.86

| fat = 1.61

| carbohydrate = 1.74

| glycemic_index = 34

}}

{{Chinese

| c = 豆奶

| p = dòunǎi

| w = tou nai

| l =

| altname = Literary Chinese name

| c2 = 豆乳

| p2 = dòurǔ

| w2 = tou ju

| l2 = bean milk

| altname3 = Archaic Chinese name

| c3 = 菽乳

| p3 = shúrǔ

| w3 = shu ju

| l3 = bean milk

| hangul =

| hanja =

| rr =

| mr =

| kanji =

| kana =

| revhep =

}}

Soy milk (or soymilk), also known as soya milk, is a plant-based milk produced by soaking and grinding soybeans, boiling the mixture, and filtering out remaining particulates. It is a stable emulsion of oil, water, and protein. Its original form is an intermediate product of the manufacture of tofu. Originating in China,{{Cite book |last=Odo |first=T. |title=Encyclopedia of Food Sciences and Nutrition |year=2003 |edition=Second |doi=10.1016/B0-12-227055-X/01114-7 }} it became a common beverage in Europe and North America in the latter half of the 20th century, especially as production techniques were developed to give it a taste and consistency more closely resembling that of dairy milk. Soy milk may be used as a substitute for dairy milk by individuals who are vegan or lactose intolerant or have a milk allergy.

Soy milk is also used in making imitation dairy products such as soy yogurt, soy cream, soy kefir, and soy-based cheese analogues. It is also used as an ingredient for making milkshakes, pancakes, smoothies, bread, mayonnaise, and baked goods.

{{anchor|Name|Etymology}}

Names

In some parts of China, the term 豆浆 dòujiāng (lit.{{nbsp}}"bean broth") is used for the traditional watery beverage produced as an intermediate product in the production of tofu, while store-bought products designed to imitate the flavor and consistency of dairy milk (and may contain a mixture of dairy and soy), are more often known as 豆奶 dòunǎi ("bean milk").{{Citation needed|date=May 2021}}

In other countries, there are sometimes legal impediments to the equivalents of the name "soy milk". In such jurisdictions, the manufacturers of plant milks typically label their products the equivalent of "soy beverage" or "soy drink".{{Citation needed|date=May 2021}}

= Naming in the EU =

In the European Union, "milk" by law refers exclusively to "the normal mammary secretion obtained from one or more milkings without either addition thereto or extraction therefrom".{{citation |contribution=Document 32013R1308: Regulation (EU) No 1308/2013 of the European Parliament and of the Council of 17 December 2013 Establishing a Common Organisation of the Markets in Agricultural Products... |contribution-url=http://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:32013R1308 |url=http://eur-lex.europa.eu |title=EUR-Lex |date=20 December 2013 |publisher=European Union |location=Brussels}}. Only cow's milk is allowed to be named "milk" on packaging, and any other milks must state the name of the respective animal: for example, "goat milk" or "sheep milk". There are exceptions for traditional products such as coconut milk.{{cite web |title=2010/791/EU: Commission Decision of 20 December 2010 listing the products referred to in the second subparagraph of point III(1) of Annex XII to Council Regulation (EC) No 1234/2007 (recast) (notified under document C(2010) 8434)|url=https://eur-lex.europa.eu/eli/dec/2010/791/oj}} The usage of the term "soy milk" became the subject of a 2017 court case before the Court of Justice of the European Union after a German consumer protection group filed an unfair competition complaint about a company describing its soy and tofu products as 'milk' or 'cheese'. The Court of Justice ruled that such designations cannot be legally used for purely plant-based products and that additions indicating the plant origin of the products (soy milk) does not influence that prohibition.{{Cite news|url=https://www.bbc.com/news/business-40274645|title=Dairy names for soya and tofu face new ban|date=14 June 2017|access-date=15 July 2019}}

History

The earliest record of soybean milk is on a stone slab of the Eastern Han dynasty unearthed in China, on which is engraved the situation of making soy milk in ancient kitchens.

A tofu broth (doufujiang) {{c.|1365}} was used during the Mongol Yuan.{{sfnp|Shurtleff|Aoyagi|2013|pp=5 & 23–4}}{{sfnp|Shurtleff|Aoyagi|2014|pp=9 & 127}} As doujiang, this drink remains a common watery form of soy milk in China, usually prepared from fresh soybeans. The compendium of Materia Medica, which was completed in 1578, also has an evaluation of soymilk. Its use increased during the Qing dynasty, apparently due to the discovery that gently heating doujiang for at least 90 minutes hydrolyzed or helped to break down its undesirable raffinose and stachyose, oligosaccharides, which can cause flatulence and digestive pain among lactose-intolerant adults.{{sfnp|Shurtleff|Aoyagi|2013|pp=23–4}}{{sfnp|Huang|2008|p=52}} By the 18th century, it was common enough that street vendors were hawking it;{{sfnp|Shurtleff|Aoyagi|2013|p=29}} in the 19th, it was also common to take a cup to tofu shops to get hot, fresh doujiang for breakfast. It was already often paired with youtiao, which was dipped into it.{{sfnp|Shurtleff|Aoyagi|2013|pp=5 & 33}} The process was industrialized in early Republican China. By 1929, two Shanghai factories were selling over 1000 bottles a day and another in Beijing was almost as productive itself.{{sfnp|Shurtleff|Aoyagi|2013|p=6}} Following disruption from the Second World War and the Chinese Civil War, soy milk began to be marketed in soft drink-like fashion in Hong Kong, Singapore, and Japan in the 1950s.{{sfnp|Shurtleff|Aoyagi|2013|pp=7–8}}

Soymilk was mentioned in various European letters from China beginning in the 17th century.{{sfnp|Shurtleff|Aoyagi|2013|p=5}} "Soy milk" entered the English language (as "soy-bean milk") in an 1897 USDA report.{{sfnp|Langworthy|1897}}{{sfnp|Shurtleff|Aoyagi|2009|p=174}} Li Yuying established Caséo-Sojaïne, the first soy milk "dairy", in Colombes, France, in 1910; he received the first British and American patents for soy milk manufacturing in 1912 and 1913.{{sfnp|Shurtleff|Aoyagi|2013|p=6}} J.A. Chard began production of "Soy Lac" in New York City, United States, in 1917.{{sfnp|Shurtleff|Aoyagi|2013|p=6}} Harry W. Miller—an American businessman forced to relocate his factory from Shanghai owing to World War II—was similarly compelled by the USDA and the US dairy industry to use the term "Soya Lac" rather than "soy milk".{{sfnp|Shurtleff|Aoyagi|2013|p=6}} John Harvey Kellogg had been working with what he called "soymilk" at his Battle Creek Sanitarium since 1930, but was similarly compelled to market his acidophilus-enriched beverage as "Soygal" when it began commercial production in 1942.{{sfnp|Shurtleff|Aoyagi|2004}}

A string of 40 court cases against Rich Products between 1949 and 1974 finally established that non-dairy "milks" and imitation dairy products were "a new and distinct food", rather than inferior and illegal knock-offs.{{sfnp|Shurtleff|Aoyagi|2013|p=6}} Cornell researchers established the enzyme lipoxygenase as responsible for the "beany" flavor of soy milk made in 1966; the same research established a process for reducing or eliminating the bean flavor from commercial products.{{sfnp|Shurtleff|Aoyagi|2013|p=8}}{{cite web|title=Soy milk: terrible or terrific|url=http://www.prosoya.com/wp-content/uploads/2014/03/br_intsoy.pdf|author=Raj Gupta|publisher=ProSoya|date=2014|access-date=9 May 2020}} With Tetra Pak cartons extending its shelf-life, Hong Kong-based Vitasoy reintroduced soy milk to the US market in 1980 and brought it to 20 other countries within a few years.{{sfnp|Shurtleff|Aoyagi|2013|p=8}} Alpro similarly began production in Belgium in 1980, quickly becoming Europe's leading producer.{{sfnp|Shurtleff|Aoyagi|2013|p=8}} New production technology and techniques began to permit soy beverages with an appreciably more milk-like flavor and consistency in the mid-1980s.{{sfnp|Shurtleff|Aoyagi|2013|pp=8–9}}

Preparation

Soy milk is made from whole soybeans or full-fat soy flour.{{cite journal |pmc=5302266|year=2013|last1=Jiang|first1=S.|title=Food quality improvement of soy milk made from short-time germinated soybeans|journal= Foods|volume=2|issue=2|pages=198–212|last2=Cai|first2=W.|last3=Xu|first3=B.|pmid=28239109|doi=10.3390/foods2020198|doi-access=free}} The dry beans are soaked in water for a minimum of three hours up to overnight depending on the temperature of the water. The rehydrated beans then undergo wet grinding with enough added water to give the desired solids content to the final product which has a protein content of 1–4%, depending on the method of production. The ratio of water to beans on a weight basis is 10:1 for traditional soy milk. The resulting slurry or purée is brought to a boil to improve its taste properties (see "Soy odor" below), by heat inactivating soybean trypsin inhibitor, and to sterilize the product. Heating at or near the boiling point is continued for a period of time, 15–20 minutes, followed by the removal of insoluble residues (soy pulp fiber) by straining/filtration.

Processing requires the use of an anti-foaming agent or natural defoamer during the boiling step. Bringing filtered soy milk to a boil avoids the problem of foaming. It is generally opaque, white or off-white in color, and approximately the same consistency as cow's milk. Quality attributes during preparation include germination time for the beans used, acidity, total protein and carbohydrates, phytic acid content, and viscosity. Raw soy milk may be sweetened, flavored, and fortified with micronutrients. Once fully processed, soy milk products are typically sold in plastic bottles or plastic-coated cartons, such as tetrapaks.

= Soy odor =

Traditional East Asian soymilk has a "beany" odor, partly of hexanal, considered disagreeable by most Westerners. This is caused by the lipooxygenase (LOX) in the soy oxidizing the fat in the beans. Rehydrating the beans allows the reaction to proceed with the oxygen gas dissolved in soaking water.{{cite journal |last1=Hildebrand |first1=David |last2=Kemp |first2=Thomas |last3=Andersen |first3=Roger |last4=Loughrin |first4=John |title=Method of Reducing Odor Associated with Hexanal Production in Plant Products |url=https://uknowledge.uky.edu/pss_patents/27/ |journal=Plant and Soil Sciences Faculty Patents |date=21 May 1991}} To eliminate the odor, one can either disable the LOX enzyme with heat or remove the oxygen dissolved in the water. The former can be achieved by soaking beans in hot water (a "hot grind"), skipping the soak entirely, or blanching the soy in water or steam first.{{cite journal |last1=Zhang |first1=Yan |last2=Guo |first2=Shuntang |last3=Liu |first3=Zhisheng |last4=Chang |first4=Sam K. C. |title=Off-Flavor Related Volatiles in Soymilk As Affected by Soybean Variety, Grinding, and Heat-Processing Methods |journal=Journal of Agricultural and Food Chemistry |date=1 August 2012 |volume=60 |issue=30 |pages=7457–7462 |doi=10.1021/jf3016199 |pmid=22812487|bibcode=2012JAFC...60.7457Z }} The latter can be achieved by a variety of chemical means, such as adding glucose and glucose oxidase to consume the oxygen.{{cite web |last1=Takenawa |first1=Seishi |last2=Takeda |first2=Hideki |last3=Horikoshi |first3=Mie |title=Process for preparation of soya milk with an improved flavor |url=https://patents.google.com/patent/EP0328322A2 |language=en |date=16 August 1989}} The soybean cultivar also influences the odor{{cite journal |last1=Yuan |first1=S |last2=Chang |first2=SK |title=Selected odor compounds in soymilk as affected by chemical composition and lipoxygenases in five soybean materials. |journal=Journal of Agricultural and Food Chemistry |date=24 January 2007 |volume=55 |issue=2 |pages=426–31 |doi=10.1021/jf062274x |pmid=17227075|bibcode=2007JAFC...55..426Y }} and a mutant cultivar lacking LOX completely has been produced.{{cite journal |last1=Zhou |first1=Yanping |last2=Li |first2=Xingfei |last3=Hua |first3=Yufei |last4=Kong |first4=Xiangzhen |last5=Zhang |first5=Caimeng |last6=Chen |first6=Yeming |last7=Wang |first7=Shaodong |title=The absence of lipoxygenase and 7S globulin of soybeans and heating temperatures on the properties of soymilks and soy yogurts |journal=LWT |date=November 2019 |volume=115 |pages=108431 |doi=10.1016/j.lwt.2019.108431|s2cid=199647823 }}

The issue and preference of soy odor also affects products made from soymilk, especially tofu. See {{section link|Tofu|Flavor}}.

Commerce

With soybean production increasing worldwide during the early 21st century,{{cite web |title=Top 4 Trends Impacting the Global Soy Milk and Cream Market Through 2020: Technavio |url=https://www.businesswire.com/news/home/20161107006231/en/Top-4-Trends-Impacting-Global-Soy-Milk |publisher=BusinessWire |access-date=9 January 2020 |date=7 November 2016}} and consumer interest in plant milks growing from demand in Asia, Europe, and the United States,{{cite web |title=2019 State of the Beverage Industry: Dairy category benefits from flexible consumers: New forms of alternative milks emerge |url=https://www.bevindustry.com/articles/92237-2019-state-of-the-beverage-industry-dairy-category-benefits-from-flexible-consumers |publisher=Beverage Industry Magazine |access-date=9 January 2020 |date=15 July 2019}}{{cite web |author1=Achla Bharti |title=The Growth Of Soy-Milk As A Dairy Alternative |url=https://industryeurope.com/the-growth-of-soy-milk-as-a-dairy-alternative/ |publisher=Industry Europe, Focus Media Group Ltd |access-date=9 January 2020 |date=25 August 2019}} soy milk became the second-most consumed plant milk (after almond milk) by 2019.{{Cite news|url=https://www.bbc.co.uk/news/science-environment-46654042|title=Climate change: Which vegan milk is best?|author1=Clara Guibourg |author2=Helen Briggs |date=22 February 2019|work=BBC News: Science and Environment |access-date=25 October 2019}}{{cite news |author1=Amelia Lucas |title=5 charts that show how milk sales changed and made it tough for Dean Foods to avert bankruptcy |url=https://www.cnbc.com/2019/11/13/5-charts-that-show-how-milk-sales-have-changed.html|work=CNBC |access-date=9 January 2020 |date=13 November 2019}} Soy milk sales declined in the United States during 2018–19, mainly due to the rising popularity of almond milk and loss of market share to the successful introduction of oat milk.{{cite web |author1=Emily Saladino |title=Got Milk Decision Fatigue? The Pain and Politics of Soy, Almond, Oat, and Cow's Milks |url=https://vinepair.com/articles/best-milk-soy-almond-health-environment-guide/ |publisher=VinePair Inc. |access-date=9 January 2020 |date=17 January 2019}}

According to market research in 2019, the worldwide market for soy milk was growing at an annual rate of 6%, and was forecast to reach $11 billion in total commerce by 2025.{{cite web |title=Soy Milk Market Size Worth $11.08 Billion By 2025; CAGR: 6.1% |url=https://www.grandviewresearch.com/press-release/global-soy-milk-market |publisher=Grandview Research |access-date=9 January 2020 |date=1 April 2019}} Growth in consumption was due mainly to expanding the flavors of sweetened soy milks and uses in desserts, whereas unsweetened soy milk was being used particularly in Asia-Pacific countries as an ingredient in snacks and various prepared foods.

Usage

= Nutrition =

A cup (243 mL) serving of a generic unsweetened commercial nutrient-fortified brand of soy milk provides 80 calories from 4 g of carbohydrates (including 1 g of sugar), 4 g of fat and 7 g of protein.{{citation |contribution-url=https://ndb.nal.usda.gov/ndb/foods/show/4913 |contribution=Basic Report: 16222, Soymilk (All Flavors), Unsweetened, with Added Calcium, Vitamins A and D |publisher=US Department of Agriculture, Agricultural Research Service |title=USDA Food Composition Database |url=https://fdc.nal.usda.gov |location=Washington |date=2016}}. This processed soy milk contains appreciable levels of vitamin A, B vitamins, and vitamin D in a range of 10 to 45% of the Daily Value, with calcium and magnesium also in significant content.

It has a glycemic index of 34±4.{{harvp|Atkinson|Foster-Powell|Brand-Miller|2008}}. For protein quality, one study gave soya milk a Digestible Indispensable Amino Acid Score (DIAAS) of 78% for infants, 99% for young children, and 117% for older children, adolescents, and adults, with the limiting amino acid for those groups being leucine, lysine, and valine respectively.{{cite journal|last1=Reynaud| first1=Yohan |collaboration=y |year=2021 |title=True ileal amino acid digestibility and digestible indispensable amino acid scores (DIAASs) of plant-based protein foods |journal=Food Chemistry |volume=338 |page=128020 |doi=10.1016/j.foodchem.2020.128020 | pmid=32932087 | s2cid=221746468 | url=https://hal.inrae.fr/hal-02946774/file/Manuscript%20DIAAS%20V10%20DR-reveiwed.pdf }} A DIAAS of 100% or more is considered to be an excellent/high protein quality source.{{citation|title=Report of an FAO Expert Consultation, 31 March - 2 April 2011, Auckland, New Zealand|year=2013|publisher=Food and Agriculture Organization|isbn=9789251074176|page=43}}

{{Milk nutrition}}

= Taste =

{{Chinese

| title = Doujiang

| pic = File:Taipei breakfast with fresh soymilk 20071023.jpg

| piccap = A youtiao with a bowl of doujiang

| t = 豆漿

| s = 豆浆

| l = soybean broth

| p = dòujiāng

| w = tou chiang

| mi = {{IPAc-cmn|d|ou|4|.|j|iang|1}}

| j = dau6-zoeng1

| y = dauh-jēung

| altname = Historic name

| t2 = 豆腐漿

| s2 = 豆腐浆

| p2 = dòufujiāng

| w2 = tou-fu chiang

| l2 = tofu broth

}}

Manufactured, sweetened soy milk has an oatmeal-like, nutty flavor.{{cite web |author1=Serena Ball |title=All the Non-Dairy Milks on the Market, Reviewed and Ranked |url=https://www.foodnetwork.com/healthyeats/food-and-nutrition-experts/2018/4/newest-plant-based-milks |publisher=FoodNetwork |access-date=21 May 2021 |date=22 January 2021}} In acidic hot drinks, such as coffee, curdling may occur, requiring some manufacturers to add acidity regulators.{{cite journal |last1=Brown |first1=Mairi |last2=Laitano |first2=Francesca |last3=Williams |first3=Calum |last4=Gibson |first4=Bruce |last5=Haw |first5=Mark |last6=Sefcik |first6=Jan |last7=Johnston |first7=Karen |title='Curdling' of soymilk in coffee: A study of the phase behaviour of soymilk coffee mixtures |journal=Food Hydrocolloids |date=1 October 2019 |volume=95 |pages=462–467 |doi=10.1016/j.foodhyd.2019.04.032 |s2cid=145932645 |url=https://strathprints.strath.ac.uk/67572/8/Brown_etal_FH_2019_Curdling_of_soymilk_in_coffee_a_study_of_the_phase_behaviour.pdf }}

==Phytic acid==

Soybeans, and soy milk in particular, contain phytic acid{{Citation needed|date=August 2022}}, which may act as a chelating agent and inhibit mineral absorption, especially for diets already low in minerals.{{cite book | chapter = Phytates | title = Toxicants Occurring Naturally in Foods | author = Committee on Food Protection, Food and Nutrition Board, National Research Council | publisher = National Academy of Sciences | location = Washington, DC | year = 1973 | isbn = 978-0-309-02117-3 | pages = [https://archive.org/details/toxicantsoccurri0000unse/page/363 363–71] | chapter-url = https://books.google.com/books?id=lIsrAAAAYAAJ&pg=PA363 | url = https://archive.org/details/toxicantsoccurri0000unse/page/363 }}{{cite news |title=How do phytates impact calcium absorption? |url=https://americanbonehealth.org/nutrition/how-do-phytates-impact-calcium-absorption/ |agency=American Bone Health |date=2011}} However, dietary intake of phytic acid may help reduce the risk of developing colon cancer.{{Cite journal |last1=Graf |first1=E. |last2=Eaton |first2=J. W. |date=1993 |title=Suppression of colonic cancer by dietary phytic acid |url=https://pubmed.ncbi.nlm.nih.gov/8383315/ |journal=Nutrition and Cancer |volume=19 |issue=1 |pages=11–19 |doi=10.1080/01635589309514232 |issn=0163-5581 |pmid=8383315}}{{Cite journal |last=Reddy |first=Bandaru S |date=1999-01-25 |title=Role of dietary fiber in colon cancer: an overview |url=https://www.sciencedirect.com/science/article/pii/S0002934398003416 |journal=The American Journal of Medicine |language=en |volume=106 |issue=1, Supplement 1 |pages=16–19 |doi=10.1016/S0002-9343(98)00341-6 |pmid=10089109 |issn=0002-9343|url-access=subscription }}

=Regional=

{{more citations needed|section|date=January 2020}}

File:Soy milk soup with wonton cc flickr user jetalone 2.jpgs]]

Soy milk is a common beverage in East Asian cuisines.

In many countries, soy milk is used in vegan and vegetarian food products and as a substituve replacement for cow's milk in many recipes. Soy milk is also used in making imitation dairy products such as soy yogurt, soy cream, soy kefir and soy-based cheese analogues. It is also used as an ingredient for making milkshakes, pancakes, smoothies, bread, mayonnaise, and baked goods.

Ecological effects

{{Bar chart |title=Mean water footprint for one glass (200 g) of different milks |float=right |label_type=Milk types |data_type=Water use (L per 200 g) |bar_width=20 |width_units=em |data_max=131 |label1=Cow's milk |data1=131 |label2=Almond milk |data2=74 |label3=Rice milk |data3=56 |label4=Oat milk |data4=9 |label5=Soy milk |data5=2 |label6= |data6=}}

{{Bar chart|title=Mean greenhouse gas emissions for one glass (200g) of different milks|float=right|label_type=Milk Types|data_type=Greenhouse gas emissions (kg CO2-Ceq per 200g)|bar_width=20|width_units=em|data_max=.6|label1=Cow milk|data1=0.62|label2=Rice milk|data2=0.23|label3=Soy milk|data3=0.21|label4=Oat milk|data4=0.19|label5=Almond milk|data5=0.16|label6=|data6=|label7=|data7=|label8=|data8=|label9=|data9=|label10=|data10=|label11=|data11=|label12=|data12=|label13=|data13=}} Using soybeans to make milk instead of raising cows is ecologically advantageous.{{cite journal |last1=Holmes |first1=Bob |title=How sustainable are fake meats? |journal=Knowable Magazine |date=20 July 2022 |doi=10.1146/knowable-071922-1|s2cid=250938804 |doi-access=free |url=https://knowablemagazine.org/article/food-environment/2022/how-sustainable-are-fake-meats |access-date=1 August 2022 |language=en}}{{cite web |url=http://www.fao.org/docrep/010/a0701e/a0701e02.pdf |title=Livestock's long shadow – Environmental issues and options; Chapter 2, Livestock in geographic transition |publisher=United Nations, Food and Agriculture Organization, Rome |date=2006}} Cows require much more energy to produce milk, since the farmer must feed the animal, which can consume up to {{convert|24|kg|lb}} of food in dry matter basis and {{convert|90|to|180|L|gal}} of water a day, producing an average of {{convert|40|kg|lb}} of milk a day. Legumes, including the soybean plant, also replenish the nitrogen content of the soil in which they are grown.{{cn|date=October 2024}}

The cultivation of soybeans in South America is a cause of deforestation (specifically in the Amazon rainforest) and a range of other large-scale environmental harm.{{cite web |url=http://wwf.panda.org/what_we_do/footprint/agriculture/soy/impacts/ |title=Environmental & social impacts of soy |publisher=World Wildlife Fund |access-date=14 August 2015}} However, the majority of soybean cultivation worldwide, especially in South America where cattle farming is widespread, is intended for livestock fodder rather than soy milk production.{{cite web |url=http://wwf.panda.org/what_we_do/footprint/agriculture/soy/consumers/ |title=Soy is Everywhere |publisher=World Wildlife Fund |access-date=14 August 2015}}

See also

{{div col|colwidth=30em}}

References

{{reflist}}

Bibliography

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