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Dalle, Jean-Hugues; Auvrignon, Anne; Vassal, Gilles; Leverger, Guy . (2002). Interaction Between Methotrexate and Ciprofloxacin. Journal of Pediatric Hematology/Oncology, 24(4), 321–322. doi:10.1097/00043426-200205000-00021 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research