Analytical evaluation of gestogens in oral contraceptives.
D002855:Chromatography, Thin Layer; D003276:Contraceptives, Oral / Q000032:analysis*; D012739:Gonadal Steroid Hormones / Q000032:analysis*; D008722:Methods; D013053:Spectrophotometry
D003276:Contraceptives, Oral; D012739:Gonadal Steroid Hormones