Goel, A., P. Gupta, A. Singh, and K. Singh. “Endometrial Evaluation With Methylene Blue Staining in Patients With Normal Hysteroscopy”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 8, no. 7, June 2019, pp. 2715-9, doi:10.18203/2320-1770.ijrcog20193031.