1. Congenital malformations in twins;Hay;am J Hum Genet,1970
2. Congenital malformations in twins;Myrianthopoulos;Acta Genet Med Gemellol (Roma),1976
3. Monozygotic twinning and the Duhamel anomalad (imperforate anus to sirenomelia): A nonrandom association between two aberrations in morphogenesis;Smith;Birth Defects,1976
4. Missildungen bei Zwilligen;Mohr;Ergeb Inn Med Kinderheilkd,1972
5. Anencephaly with incomplete twinning (disprosopus);Riccardi;Teratology,1977