M. A. Kamel, A. F. Amin, T. A. Farghaly, and N. A. Farrag, “Clomiphene citrate plus N-acetyl cysteine versus letrozole for induction of ovulation in infertile patients with polycystic ovarian disease: a randomized clinical trial”, Int J Reprod Contracept Obstet Gynecol, vol. 8, no. 10, pp. 3959–3963, Sep. 2019.