Sharma, Nidhi, Shikha Rani, Anju Huria, and Deepak Chawla. “Oral Nifedipine Versus Nitroglycerine Patch for Tocolysis in Preterm Labour”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology 8, no. 1 (December 26, 2018): 174–178. Accessed February 16, 2025. https://www.ijrcog.org/index.php/ijrcog/article/view/5781.