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Sun, L.X.; Bu, Y.X.; Qiao, Q.G.; Liu, Q.W.; Guo, Z.L., The effect of ionization and deprotonation of guanine on the formation of base pairs, Comp. Theor. Chem., 2012, 980, 23-31, https://doi.org/10.1016/j.comptc.2011.11.007 . [all data]