A survey on composition and microbiota of fresh and fermented yak milk at different Tibetan altitudesXiao-He Wu, Zhang Luo, Li Yu, Fa-Zheng Ren, Bei-Zhong Han and M.J. Robert NoutDairy Sci. Technol., 89 2 (2009) 201-209DOI: https://doi.org/10.1051/dst/2009007