1. Congenital abnormalities of the urachus;Kontogeorgos;Int Urol Nephrol,1977
2. Anatomic variants of the urachus related to clinical appearance and surgical treatment of urachal lesions;Blichert-Toft;Surg Gynecol Obstet,1973
3. Abnormalities of the bladder and prostate;Shaw,1979
4. Abnormalities of the bladder and prostate;Shaw,1979
5. Congenital patent urachus and acquired variants;Blichert-Toft;Acta Chir Scand,1971