Kesseru, Esteban; Camacho-Ortega, Pedro; Laudahn, Gerhard; Schopflin, Gisela
(Elsevier, 1975)
The presence of progestogens in the cervical mucus suppresses and arrests sperm penetration. Using the Kremer technique, the effects of in vitro released progesterone, d norgestrel, and cyproterone acetate were studied by ...