1. Perinatal mortality rates do not contain what they purport to contain;MJMINC, Keirse;Lancet,1984
2. Is perinatal mortality still a good indicator of perinatal care?;Field, D.J.; Smith, H.; Mason, E.; Milner, A.D.;Paediatric and Perinatal Epidemiology,1988
3. International classifcazion of diseases, tnjurnes and causes ofdeath;World Health Organisation;9th Ret^zsion,1975