Balwinder Kaur, et al. “Comparison of Effect of Drotavarine Hydrochloride and a Combination of Hyoscine-N-Butyl Bromide & Valethamate Bromide on Duration of Active Phase of Labor”. Issues and Developments in Medicine and Medical Research Vol. 11, Mar. 2022, pp. 18-38, doi:10.9734/bpi/idmmr/v11/2166C.