1. Inhibition of ovulation by estrogens;Gual;Am. J. Obst. & Gynec.,1967
2. New oral contraceptive; sequential estrogen and progestin;Goldzieher;Am. J. Obst. & Gynec.,1964
3. Control de la fertilidad; régimen secuencial;Rice-Wray;Rev. Fac. Med. Mexico,1967
4. Accomplishments and new aspects of contraception;IJzerman;J. Egyptian Med. Assoc.,1968
5. Antikonception med et normofasisk praeparat Ovanon;Persson;Soertryk af Ugeskr.,1971