1. The perinatal mortality rate as a measure of the efficiency of the maternity services;Baird;Hlth Bull (Edin),1977
2. Interpretation of perinatal statistics;Chalmers,1980
3. Obstetric service and perinatal mortality in Norway;Bakketeig;Acta Obstet Gynecol Scand,1978
4. The very low-birthweight rate: principal predictor of neonatal mortality in industrialized populations;Lee;J Pediatr,1980
5. Prospects for better perinatal health;Alberman;Lancet,1980