1. Manual of the international statistical classification of diseases, injuries and causes of death. 9th revision. Vol 1;World Health Organisation,1977
2. Perinatal mortality rates;Alberman, E.;Br J Hosp Med,1978
3. Interpretation of perinatal statistics;Chalmers, I.; McFarlane, A.,1980
4. Quarterly return for Northern Ireland, quarter ended 31st December 1979 (also preliminary return for the year 1979);General, Registrar,1980
5. Perinatal audit and surveillance;Chalmer, I.