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Li, Z.; Matus, M.H.; Velazquez, H.A.; Dixon, D.A.; Cassady, C.J., Gas-phase acidities of aspartic acid, glutamic acid, and their amino acid amides, Int. J. Mass Spectrom., 2007, 265, 2-3, 213-223, https://doi.org/10.1016/j.ijms.2007.02.009 . [all data]