1. A survey of mongoloid births in Victoria, Australia, 1942-1957;Collmann;Amer. J. publ. Hlth.,1962
2. Shift of child-birth to younger mothers, and its effect on the incidence of mongolism in Victoria, Australia, 1939-1964;Collmann;J. ment. Defic. Res.,1969
3. A survey of 972 cytogenetically examined cases of Down syndrome;Gardner;N. Z. med. J.,1973
4. Higurashi , M. 1975
5. Falling maternal age and incidence of Down syndrome;Jones;Lancet,1975