1. Eine neue Methode zur Bestimmung des Ovulationstermines;Knaus;Zentralbl Gynakol,1929
2. Ovulationstermin and Konzeptionstermin;Ogino;Zentralbl Gynakol,1930
3. Determination de la periode sterile premenstruelle par la courbe thermique;Ferin;Bruxelles Medica,1947
4. Symptoms and hormonal changes accompanying ovulation;Billings;Lancet,1972
5. Temporal relationships between ovulation and defined changes in the concentration of plasma estradiol-17β, luteinizing hormone, follicle stimulating hormone and progesterone. 1 Probit analysis;Am J Obstet Gynecol,1980