Chavan, M. S., and M. J. Jassawalla. “Comparison of Perinatal Outcome in Twin Pregnancy With and Without Cervical Cerclage”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 5, no. 11, Dec. 2016, pp. 3924-30, doi:10.18203/2320-1770.ijrcog20163866.