1. Single umbilical artery: a statistical analysis of 237 autopsy cases and review of the literature;Heifetz;Perspect Pediatr Pathol,1984
2. Alsia of one umbilical artery: incidence by race and certain obstetric factors;Peckham;Obstet Gynecol,1965
3. The association of single umbilical artery with cytogenetically abnormal pregnancies;Saller;Am J Obstet Gynecol,1990
4. A critical description of three cases of single hypogastric artery in the human fetus;Duckworth,1908
5. A vascular anomaly of the umbilical cord: the absence of one umbilical artery in the umbilical cords of normal and abnormal fetuses;Benirschke;Obstet Gynecol,1955