J. Quintero, H. Olguín, A. Quezada, H. Janacua, R. Rivas, and U. Macías, “Effect of hCG application on day 12 post-mating on the reproductive efficiency and plasmatic concentrations of progesterone in hair ewes”, Cuban J. Agric. Sci., vol. 49, no. 4, Mar. 2016.