S. RAJA, S. BALASUBRAMANIAN, G. DHINAKARRAJ, and C. VEERAPANDIAN, “Expression pattern of OCT 4, NANOG and HSP 90 β gene in oocytes and various stages of in vitro produced sheep embryos”, Indian J of Anim Sci, vol. 85, no. 11, pp. 1187–1189, Nov. 2015, doi: 10.56093/ijans.v85i11.53143.