Angelova, M. A.; Kovachev, E. G.; Kozovski, I.; Kornovski, Y. D.; Kisyov, S. V.; Ivanova, V. R. A Case of Secondary Abdominal Pregnancy After in Vitro Fertilization Pre-Embryo Transfer (IVF-ET). Open Access Maced J Med Sci 2015, 3, 426-428.