M. G. M. Chacur, P. T. F. Aurélio, O. Scalon Júnior, L. Inague, L. F. Scalon, and S. do N. Kronka, “Effects of lower doses of cloprostenol intramuscular or into vulvar submucosa on estrus induction and pregnancy rates in Nelore cows”, Semina: Ciênc. Agrár., vol. 31, no. 2, pp. 451–458, Jul. 2010.