Foz Filho, R. P. de P., Fernandes Filho, A., & Borelli, V. (1999). Morphological aspects of the spermatic cord in mules (Equus asinus x Equus caballus). Brazilian Journal of Veterinary Research and Animal Science, 36(4), 183-187. https://doi.org/10.1590/S1413-95961999000400003