Spectroscopic characterization of 4-methylamphetamine: formaldehyde adduct formation hindered the identification by mass spectrometryVera Coopman, Pieter Delbeke, Annemie Van Ingelgem, Marc De Leeuw et Jan CordonnierAnn Toxicol Anal, 24 4 (2012) 159-163DOI: https://doi.org/10.1051/ata/2012021