Vicente, Wilter Ricardo Russiano, et al. “Anátomo Histopathologic Evaluation of the Effect of Medroxiprogesterone Acetate and Megestrol Acetate on the Uterus of Adult Bitches”. Brazilian Journal of Veterinary Research and Animal Science, vol. 28, no. 2, Dec. 1991, pp. 219-2, https://doi.org/10.11606/issn.1678-4456.bjvras.1991.51941.