1. Oral contraception by norethynodrel;Cook;Am. J. Obst. & Gynec.,1961
2. Study of norethindrone in contraception;Goldzieher;J.A.M.A.,1962
3. Fertility following termination of contraception with norethindrone: Endometrial morphology and conception rate;Goldzieher;Am. J. Obst. & Gynec.,1962
4. Maqueo, M., Perez-Vega, E., Goldzieher, J. W., Martínez-Manautou, J., and Rudel, H., A comparison of the endometrial activity of three synthetic progestins. Am. J. Obst. & Gynec., in press.
5. Munguía, Dr. Hector, cytologist of the Maternity Hospital of Social Security, Mexico City. Personal communication.