Tresukosol , D., B. Uerpairojkit, P. Witoonpanich, and S. Paosavasdi. “Correlation of Uterine Blood Flow (UBL), Endometrial Thickness and Histopathology via Transvaginal Ultrasonoqraphy (TVS)”. Thai Journal of Obstetrics and Gynaecology, vol. 7, no. 1, Jan. 1995, pp. 9-14, https://he02.tci-thaijo.org/index.php/tjog/article/view/257760.