1. Congenital malformations Notes and comments;Warkany,1971
2. A cytogenetic survey of 14,069 newborn infants;Hamerton;Clin Genet,1975
3. Prevalence of Edwards' syndrome. Clustering and seasonal variation;Nielsen;Humangenetik,1975
4. Apparent fetal distress in trisomy E syndrome;Voigt;Obstet Gynecol,1970
5. Trisomy 18 and antepartal fetal distress;Karp;J Reprod Med,1977