1. The risk of repeated preterm or low birth weight delivery;Bakketeig,1977
2. Bakketeig, L. S., Hoffman, H. J., and Harley, E. E.: Perinatal survival in relation to the tendency to repeat gestational age and birth weight in successive births. In preparation.
3. A practical classification of newborn infants by weight and gestational age;Battaglia;J. Pediatr,1967
4. Maternal serum-alpha-fetoprotein measurements as an early indicator of low birth weight;Brock;Lancet,1977
5. Medical Registration of Births in Norway during the 5-year period 1967–1971;Bjerkedal,1975