1. Depression of the progesterone levels in women treated with synthetic gestagens after ovulation;Johansson;Acta endocr. (Kbh),1971
2. Interference with the normal function of the corpus luteum by oral administration of synthetic gestagens;Nygren;Acta endocr. (Kbh) Suppl.,1971
3. Postovulatory contraception in women with large doses of norethindrone;Nygren;Contraception,1972
4. Luteinizing hormone (LH) and progesterone in plasma and oestrogens in urine during 42 normal menstrual cycles;Johansson;Acta endocr. (Kbh),1971
5. Single luteal phase serum progesterone assay as an indication of ovulation;Israel;Am. J. Obstet. Gynec.,1972