1. Editorial: Choice of controls
2. 2 Hoffman, H.J., Hunter, J.C., Ellish, N.J. et al. Adverse reproductive factors and the sudden infant death syndrome. In: Sudden Infant Death Syndrome: Risk Factors and Basic Mechanisms. Editors: R.M.Harper, H.J.Hoffman. New York: PMA Publishing, 1988; pp. 153-176.
3. Sudden unexpected death in infants in the Oxford Record Linkage area: an analysis in regard to time and space;Fedrick;British Journal of Preventive and Social Medicine,1973
4. 4 Chasnoff, I.J. , Landress, H.J. , Barrett, M.E. The prevalence of illicit drug or alcohol use during pregnancy and discrepancies in mandatory reporting in Pinellas County, Florida. New England Journal of Medicine, 1990;1202-1206.
5. Sudden and unexpected death between 1 and 5 years;Southall;Archives of Disease in Childhood,1987