A. Kukol, F. Strehle, G. Thielking, H.-Fr. Grützmacher. Methyl group effect on the proton affinity of methylated acetophenones studied by two mass spectrometric techniques// Organic Mass Spectrometry Volume 28 Issue 10, Pages 1107 - 1110
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http://dx.doi.org/10.1002/oms.1210281021