1. I. JOHNSON, H. W. (1945), Am. J7. Obst. Gyn., 50, 248-254.
2. Brit;MIELS, W.G.;Med.7,1948
3. MACAFEE, C. H. G. (1945),Jg. Obst. Gyn. Brit. Emp., 52, 313.
4. MACAFEE, C. H. G. (1945), Proc. Roy. Soc. Med., 39, 9.
5. Antenatal and Postnatal Care,;BROWNE, F.J.,1946