Olaleye, A. A., B. N. Ejikeme, E. E. S. Ede, N. E. Okeke, B. I. Olinya, C. N. Edene, J. C. Obasi, E. O. Onyekelu, and A. V. Nwafor. “Heterotropic Pregnancy: A Common Masquerade Than Ever Thought?”. International Journal of Basic & Clinical Pharmacology, vol. 10, no. 12, Nov. 2021, pp. 1410-3, doi:10.18203/2319-2003.ijbcp20214508.