Kaur, D., and H. Singh. “Study of Obstetric and Perinatal Outcome in Previous Cesarean by Sonographic Evaluation of Scar Thickness of Lower Uterine Segment at Term”. International Journal of Scientific Reports, vol. 1, no. 3, July 2015, pp. 159-62, doi:10.18203/issn.2454-2156.IntJSciRep20150350.