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Bernaschek, Gerhard; Rudelstorfer, Rudolf; Csaicsich, Peter . (1988). Vaginal sonography versus serum human chorionic gonadotropin in early detection of pregnancy. American Journal of Obstetrics and Gynecology, 158(3), 608–612. doi:10.1016/0002-9378(88)90039-7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research