M. G. M. Chacur, C. M. Menezes, L. J. B. Netto, and S. do N. Kronka, “Efficiency of half-dosis of Cloprostenol subvulvar mucous inducing estrus and pregnant rate in cows ‘repeat breeders’ Nelore-Chianina”, Semina: Ciênc. Agrár., vol. 26, no. 3, pp. 387–394, Jun. 2005.