Mehra, D., and A. Saiyyed. “Endometrial Stromal Sarcoma: A Rare Form of Undifferentiated Endometrial Cancer”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 10, no. 11, Oct. 2021, pp. 4315-6, doi:10.18203/2320-1770.ijrcog20214065.