K. Botta Venkata Satya, B. Atla, U. Prasad, U. Namballa, and S. Prabhakula, “A study of placental morphology and correlation with colour doppler ultrasonography, maternal and neonatal outcome in high risk pregnancies”, Int J Res Med Sci, vol. 6, no. 10, pp. 3364–3369, Sep. 2018.