1. Abdominal Operations;Cope,1961
2. Strangulated hernia: A review of 1487 cases;Frankau;Brit. J. Surg.,1931
3. Serial measurement of umbilical hernia with hole gauges;Harvey;Amer. J. Dis. Child.,1963
4. Observations on the disappearance of umbilical hernias of infancy and childhood;Heifetz;Surg. Gynec. Obstet.,1963
5. Somatic Anomalies of the Umbilicus and Anterior Abdominal Wall;Hutchin;Surg. Gynec. Obstet.,1965