Bahgat, N. A. “Hysteroscopic Evaluation of Endometrial Cavity in Cases of Unexplained Infertility Patients Less Than 35 Years Old”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 11, no. 6, May 2022, pp. 1623-7, doi:10.18203/2320-1770.ijrcog20221315.