Malik, J., Rai, P., Das, A. and Das, S. 2017. Pregnancy-associated plasma protein A - a level in first trimester and its impact on pregnancy outcome. International Journal of Reproduction, Contraception, Obstetrics and Gynecology. 5, 8 (Jan. 2017), 2680–2683. DOI:https://doi.org/10.18203/2320-1770.ijrcog20162645.