Rengaraj, S., S. Vinayagam, and S. Soukath. “Spontaneous Heterotopic Triplet Pregnancy: Rare Case Report”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 5, no. 12, Dec. 2016, pp. 4496-8, doi:10.18203/2320-1770.ijrcog20164372.