T. Saha, M. K. Bharadwaj, and S. Vardhan, “A randomized controlled trial to study the efficacy of intravaginal hormonal ring for control of heavy menstrual bleeding as compared to combined oral contraceptive pills”, Int J Reprod Contracept Obstet Gynecol, vol. 9, no. 3, pp. 1205–1212, Feb. 2020.