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Karelson, M.M.; Katritzky, A.R.; Szafran, M.; Zerner, M.C., Quantitative predictions of tautomeric equilibria for 2-, 3-, and 4-substituted pyridines in both the gas phase and aqueous solution combination of AM1 with reaction field theory, J. Org. Chem., 1989, 54, 6030. [all data]