D., R. and Haripriya, V. 2021. Comparative study of efficacy of nifedipine, nitroglycerin dermal patches and isoxsuprine as tocolytic agents in suppression of preterm labour 1-year study at navodaya medical college hospital and research centre Raichur. International Journal of Reproduction, Contraception, Obstetrics and Gynecology. 10, 7 (Jun. 2021), 2806–2810. DOI:https://doi.org/10.18203/2320-1770.ijrcog20212672.