., D., M. Soni, D. Gupta, and S. Godara. “Drotaverine Hydrochloride Versus Valethamate Bromide for Cervical Dilatation in Labour: A Comparative Study”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 9, no. 5, Apr. 2020, pp. 1986-91, doi:10.18203/2320-1770.ijrcog20201793.