Kaur, Manjeet, Bharti Goel, and Jasveer Singh. 2018. “Comparative Study of Nitroglycerin Dermal Patch Versus Nifedipine in the Management of Preterm Labour”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology 7 (10):4243-48. https://doi.org/10.18203/2320-1770.ijrcog20184160.