R. PATHAK, “Association of peripartum progesterone, estradiol, cortisol, PGFM and relaxin concentrations with retention of fetal membranes in crossbred dairy cows”, Indian J of Anim Sci, vol. 90, no. 7, pp. 993–997, Oct. 2020, doi: 10.56093/ijans.v90i7.106668.