Moorthy, M. “Single-Balloon Versus Double-Balloon Catheters for Cervical Ripening before Induction of Labour in Term Singleton Pregnancies: A Systematic Review of Randomized Controlled Trials”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 15, no. 9, Aug. 2026, pp. 3628-35, doi:10.18203/2320-1770.ijrcog20263050.