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WikiPedia: Bò hoang Tây Tạng http://www.eyak.ch http://english.mammal.cn/Magazine/show.aspx?id=207... http://kekexili.typepad.com/life_on_the_tibetan_pl... http://www.alaskazoo.org/willowcrest/yak.htm http://www.animalinfo.org/species/artiperi/bos_mut... http://www.arkive.org/species/GES/mammals/Bos_grun... http://biodiversitylibrary.org/page/34357823 http://agtr.ilri.cgiar.org/BreedInformation/breedp... //dx.doi.org/10.1016%2Fj.jas.2003.10.006 http://www.fao.org/DOCREP/006/AD347E/ad347e08.htm