1. The incidence and prognostic implication of congenital absence of one umbilical artery;Benirschke;Am J Obstet Gynecol,1960
2. Fetal abnormalities associated with umbilical cords containing one umbilical artery and one umbilical vein;Lyon;Obstet Gynecol,1960
3. Single umbilical artery: Incidence, clinical significance and relation to autosomal trisomy;Lenoski;Can Med Assoc J,1962
4. Single umbilical artery: A prospective study of 2000 consecutive deliveries;Cairns;Can Med Assoc J,1964
5. Congenital and acquired lesions of the umbilical cord and spontaneous abortion;Javert;Am J Obstet Gynecol,1952