Singhal, S., L. Rajoria, P. Mital, A. Batar, R. Ainani, M. Agarwal, U. ., and K. Chaudhary. “Risk of Malignancy Index 4 in Preoperative Evaluation of Patients With Ovarian Tumours”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 7, no. 6, May 2018, pp. 2467-71, doi:10.18203/2320-1770.ijrcog20182370.