Mariappan, G. R., Panchaksharayya, H. B. and R., G. (2020) “Placental thickness as a sonographic biomarker for gestational age among singleton pregnancies”, International Journal of Reproduction, Contraception, Obstetrics and Gynecology, 9(11), pp. 4617–4620. doi: 10.18203/2320-1770.ijrcog20204821.