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Covington, Matthew F.; Pizzitola, Victor J.; Lorans, Roxanne; Pockaj, Barbara A.; Northfelt, Donald W.; Appleton, Catherine M.; Patel, Bhavika K. . (2017). The Future of Contrast-Enhanced Mammography. American Journal of Roentgenology, (), 1–9. doi:10.2214/AJR.17.18749 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research