1. Syndromes in twins;D'Alton;Semin Perinatol,1995
2. Monozygotic twinning and structural defects;Schinzel;J Pediatr,1979
3. A note on the epidemiology of acardiac monsters;James;Teratology,1997
4. Twin reversed arterial perfusion (TRAP) sequence: a study of 14 twin pregnancies with acardius;Van Allen;Semin Perinatol,1983
5. Acardiacus anceps;Das;J Obstet Gynaecol Br Emp,1902