Sadangi, P., K. Ranjeeta, and M. Jena. “A Rare Case of Chronic Ectopic Pregnancy: A Diagnostic Enigma”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 9, no. 12, Nov. 2020, pp. 5118-20, doi:10.18203/2320-1770.ijrcog20205257.