El Fattah, I. A. A. “Using Phytoestrogens As Aprophylaxis Against Irregular Uterine Bleeding Possibly Occurring While Using Depot-Medroxyprogesterone Acetate (DMPA) As a Contraceptive Method”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 3, no. 4, Feb. 2017, pp. 977-81, https://www.ijrcog.org/index.php/ijrcog/article/view/1350.