1. Curet, L. B., Clin. Obstetr. Gynecol., 13, 586, 1970.
2. Gitlin, D., Kumate, J., Morales, C., Noriega, L. and Arenalo, N., Am. J. Obstetr. Gynecol., 113, 632, 1972.
3. Heller, L, Arch. Gynak., 211, 303, 1971.
4. Heller, L.,AA in: A. W. Wilkinson, Proceedings of Parenteral Nutri-tion, Livingstone, Edinburgh, 1972.
5. Heller, L. and Huter, J., Rev. Espan. Obstetr. Ginecol., 29, 210, 1970.