R. D. and V. Haripriya, “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”, Int J Reprod Contracept Obstet Gynecol, vol. 10, no. 7, pp. 2806–2810, Jun. 2021.