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Cairnes, David A.; Evans, William E. . (1983). A Simple Preparation of the Methotrexate Metabolites 7-Hydroxymethotrexate and 4-Deoxy-4-amino-N10-methylpteroic Acid. Therapeutic Drug Monitoring, 5(3), 363–366. doi:10.1097/00007691-198309000-00021 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research