Chacur, Marcelo George Mungai, et al. “Efficiency of Half-Dosis of Cloprostenol Subvulvar Mucous Inducing Estrus and Pregnant Rate in Cows ‘repeat breeders’ Nelore-Chianina”. Semina: Ciências Agrárias, vol. 26, no. 3, June 2005, pp. 387-94, doi:10.5433/1679-0359.2005v26n3p387.