1. Dublin Maternity Hospital Reports for 1959–1960.Irish J. Med. Sci., No. 420.
2. Nesbitt, R. E. L.Perinatal Loss in Modern Obstetrics. Davis, Philadelphia.
3. Peller, S. (1948).Population Studies, 1, 105, March.
4. Buchan, W. (1803).Advice to Mothers. A. Strahan, London.
5. Little (1924).Cit. Collier, J.Brain, 47, 1–21.