Glushenkov, A.N., and D.M. Hovorun. 2014. “Prototropic Tautomerism of 9-Methylguanine: Quantum-Mechanical Investigation”. Reports of the National Academy of Sciences of Ukraine, no. 9 (September). Kyiv, Ukraine:151-56. https://doi.org/10.15407/dopovidi2014.09.151.