Yánez-Avalos, D. O.; Lépez Parra, J. C.; Moyano Tapia, J. C.; Quinteros Pozo, R. O.; Marini, P. R. Fixed-Time Artificial Insemination in Beef Cattle With Prolonged Proestrus of 60 and 72 Hours. Agron. Mesoam. 2018, 29, 363-373.