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https://www.mediafire.com/file/qs4ba8qb4y1x5pb/Chemistry_-_A_European_Journal_Volume_20_issue_26_2014_%5Bdoi_10.1002%252Fchem.201402124%5D_Sorribes%2C_Iva%u0301n%3B_Junge%2C_Kathrin%3B_Beller%2C_Matthias_--_General_Catalytic_Methylation_of_Amines_with_Formic_Acid_under.pdf/file