1. Prenatal sonographic diagnosis, Doppler velocimetric umbilical cord studies, and subsequent management of an acardiac twin pregnancy;Sherer;Obstet Gynecol,1989
2. Twin reversed arterial perfusion (TRAP) sequence: a study of 14 twin pregnancies with acardius;Van Allen;Semin Perinatol,1983
3. Holocardius: review of the literature and case report;Gillim;Obstet Gynecol,1953
4. Perinatal outcome of forty-nine pregnancies complicated by acardiac twinning;Moore;Am J Obstet Gynecol,1990
5. Color-flow and Doppler velocimetry in prenatal diagnosis of acardiac triplet;al-Malt;J Ultrasound Med,1991