1. The urinary system;Arey,1974
2. Umbilical remnants;Benson,1969
3. Umbilical Hernia;Benson,1969
4. Congenital patent urachus and acquired variants;Blichert-Toft;Acta Chir. Scand.,1971
5. Disorders of the urachus simulating intra-abdominal disorders;Blichert-Toft;Am. J. Surg.,1971