1. Cohen BH, Lilienfeld AM, Kramer S, Hyman LC (1977) Parental factors in Down's syndrome?Results of the second Baltimore case-control study. In: Hook EB, Porter IH (eds) Population cytogenetics?studies in humans. Academic Press, New York, pp 301?352
2. Hook EB (1983) Rates of Down syndrome livebirths and the history of prior spontaneous abortions of unknown karyotype. In: Marois M (ed) Prevention of congenital malformations. AR Liss Inc, New York (in press)
3. Hook EB, Cross PK (1981) Temporal increase in the rate of Down syndrome livebirths to older mothers in New York State. J Med Genet 18:29?30
4. Hook EB, Cross PK (1982) Interpretation of recent data pertinent to genetic counseling for Down Syndrome: Maternal-age specific rates, temporal trends, adjustments for paternal age, recurrence risks, risks after other cytogenetic abnormalities, recurrence risk after remarriage. In: Willey AM, Carter TP, Kelly SM, Porter IH (eds) Clinical genetics: Problems in diagnosis and counseling. Academic Press, New York
5. Hook EB, Porter IH (1980) Terminological considerations, methodological problems, temporal trends and other factors pertaining to human embryonic and fetal death. In: Porter IH, Hook EB (eds) Human embryonic and fetal death. Academic Press, New York, pp 1?18