Morais, Rosana Nogueira de, et al. “Reproductive Biology of Donkey. III. PH, Osmolality and Eletrolytes Concentration of the Semen”. Brazilian Journal of Veterinary Research and Animal Science, vol. 31, no. 2, June 1994, pp. 145-51, https://doi.org/10.11606/issn.1678-4456.bjvras.1994.52060.