1. Stephens FD, Smith ED. “Duplications and vesicointestinal fissure” In: Anorectal malformations in children: update 1988 (Birth defects, original article series) 1988;24(4) 554-5.
2. Ectopic anus in the female;Bryndorf;Acta Chir Scand,1960
3. Duplication of the primitive hindgut of the human being;Beach;Surgery,1961
4. Genitourinary and intestinal duplication: case report and survey of the literature;Breen;Obstet Gynecol,1965
5. A complete genitourinary and colonic duplication;Shah;J Ultrasound Med,2006