Hilburger , L., L. Rosenberg, A. Mitchell, D. Varner, S. Cheong, C. Castaneda, F. Alshanbari, and M. Amorim. “Idiopathic Infertility in a Friesian Stallion”. Clinical Theriogenology, vol. 11, no. 3, Sept. 2019, p. 501, doi:10.58292/ct.v11.10428.