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Ksenia Matlawska; Urszula Kalinowska; Andrea Erxleben; Regina Osiecka; Justyn Ochocki. (2005). Novel Analogues of 5-Fluorouracil – Synthesis, X-ray Crystallography, and Cytotoxic Effects in Normal Human Peripheral Blood Lymphocytes and Colon Adenocarcinoma HT 29. , 2005(15), 3109–3117. doi:10.1002/ejic.200500015 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research