Upreti, P. 2018. Twin pregnancies: incidence and outcomes in a tertiary health centre of Uttarakhand, India. International Journal of Reproduction, Contraception, Obstetrics and Gynecology. 7, 9 (Aug. 2018), 3520–3525. DOI:https://doi.org/10.18203/2320-1770.ijrcog20183375.