1. Equine urogenital system;Sisson,1975
2. The Viscera of the Domestic Animals;Schummer,1979
3. The renal pelvis: machinery that concentrates urine in the papilla;Dwyer;News Physiol Sci,2003
4. Comparative histology of the ureters of domestic animals;Calhoun;Anat Rec,1959
5. Urinary tract;Schott,1996