1. Declining incidence of central nervous system anomalies in New York State;Gittelsohn;Brit. J. Prev. & Social Med.,1962
2. Observations on twinning in New York State;Gittelsohn;Brit. J. Prev. & Social Med.,1965
3. Congenital malformation surveillance system based on vital records;Milham;Pub. Health Rep.,1963
4. The successful separation of pyopagus twins;Koop;Surgery,1961
5. Die Missbildungen des Menschen, systematisch Dargestellt;Förster,1865