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Qiao, C., Liu, X.-F., Liu, X., & He, L.-N. (2017). Copper(II)-Catalyzed Selective Reductive Methylation of Amines with Formic Acid: An Option for Indirect Utilization of CO2. Organic Letters, 19(6), 1490–1493. doi:10.1021/acs.orglett.7b00551 
10.1021/acs.orglett.7b00551