D. Hazarika, S. Sarma, P. Chakravarty, D. J. Kalita, J. Goswami, and B. C. Deka, “Testosterone in yak (Poephagus grunniens L.) bull seminal plasma and its correlation with physical characteristics of semen”, Indian J of Anim Sci, vol. 82, no. 7, July 2012, doi: 10.56093/ijans.v82i7.21755.