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Giumanini, A. G., Verardo, G., Gei, M. H., & Lassiani, L. (1987). New N-permethylations and introduction of deuterium labelled methyl groups into primary and secondary amines. Journal of Labelled Compounds and Radiopharmaceuticals, 24(3), 255–266. doi:10.1002/jlcr.2580240305 
10.1002/jlcr.2580240305