Sethi, P. D., N. Goyal, and A. Garg. “Ultrasonography: A Diagnostic Choice to Localise Intra Uterine Contraceptive Devices”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 5, no. 9, Feb. 2017, pp. 2964-7, doi:10.18203/2320-1770.ijrcog20162699.