1. Triplicate ureter;Smith;Brit. J. Surg.,1946
2. Überzählige Nieren und Dystopien;Demoullin;Z. Urol.,1955
3. A case of bilateral ureteral trifiditis with voluminous hydronephrosis;Bauchard;J. Urol.,1959
4. Bilateral ureteral quadruplication;Soderdahl;J. Urol.,1976