S. P. S. GHUMAN, M. HONPARKHE, D. DADARWAL, J. SINGH, and G. S. DHALIWAL, “Optimizing estrous period characteristics of crossbred cows exhibiting prolonged estrus using a PGF2α analogue”, Indian J of Anim Sci, vol. 84, no. 1, pp. 15–17, Jan. 2014, doi: 10.56093/ijans.v84i1.37292.