Ott, R. S., T. F. Lock, B. O. Brodie, M. A. Memon, and M. E. Mansfield. “Estrus Synchronization of Beef Cows With a Palpable Corpus Luteum Using PGF2α”. The Bovine Practitioner, vol. 1981, no. 16, Nov. 1981, pp. 69-70, doi:10.21423/bovine-vol1981no16p69-70.