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Rawlynce C. Bett, Mwai A. Okeyo, Birgitta Malmfors, Kjell Johansson, Morris Agaba, Donald R. Kugonza, A.K.F.H. Bhuiyan, Anibal E. Vercesi Filho, Arthur S. Mariante, Fidalis D. Mujibi, Jan Philipsson (2013). Cattle Breeds: Extinction or Quasi-Extant?. Resources2 (3): 335–357. doi:10.3390/resources2030335.