1. Anomalies of the upper urinary tract;Perlmutter,1979
2. Embryologic basis for lower ureteral anomalies, a hypothesis;Tanagho;Urology,1976
3. Ureterocele and Urethral Ectopic Ureter in Congenital Malformations of the Rectum, Anus, and Genitourinary Tracts;Stephens,1963