Mathew, Sunitha Mary, and Ajay Kumar. “A Prospective Analysis of the Risk Factors and the Perinatal Outcome of Preterm Labour”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology 7, no. 12 (November 26, 2018): 4833–4839. Accessed October 27, 2025. https://www.ijrcog.org/index.php/ijrcog/article/view/5815.