1. Effect of Natural and Synthetic Sex Steroids in Cervical Mucus Penetration and Ascent of Spermatozoa;Zanartu,1967
2. Morphological Changes in Ovaries of Women Treated with Continuous Microdose Progestogens;Moghissi,1972
3. Presence of corpus luteum as evidence of ovulation in women treated with low doses of Chlormadinone acetate;Gutierrez-Najar;Amer J Obstet Gynec,1968
4. Contraceptive Steroids and Their Mechanism of Action;Diczfalusy,1971
5. Low Level Progestogens;Martinez-Manautou,1971