References:

93. Thermally induced double proton transfer in GG and wobble GT base pairs: A possible origin of the mutagenic guanine, Adchara Padermshoke, Yukiteru Katsumoto, Ryuta Masaki and Misako Aida, Chemical Physics Letters, 457(1-3), 232-236 (2008).
DOI: 10.1016/j.cplett.2008.04.029

20.Characteristics of the Watson-Crick type hydrogen-bonded DNA base pairs: an ab initio molecular orbital study, Misako Aida, Journal of Computational Chemistry, 9, 362-368, 1988.
DOI: 10.1002/jcc.540090411