1. Brimblecombe F, Ashford J, Fryer J: Significance of Low Birth Weight in Perinatal Mortality: A Study of Variations within England and Wales. Br J Prev Soc Med. 1968, 22: 27-35.
2. Rooth G: Low birthweight revised. Lancet. 1980, 1: 639-641. 10.1016/S0140-6736(80)91130-7.
3. Goldstein H: Factors related to Birth Weight and Perinatal Mortality. Br Med Bull. 1981, 37: 259-264.
4. Fryer J, Hunt R, Simons A: Biostatistical Considerations: The Case for Using Models. Child Health. 1984, 3: 9-30.
5. Kleinman JC: Methodological Issues in the Analysis of Vital Statistics. Reproductive and Perinatal Epidemiology. Edited by: Kiely M. 1991, Boca Raton: CRC Press, 453-462.