Ivanov, A. Y., Stepanian, S. G., Karachevtsev, V. A., & Adamovicz, L. (2022). Tautomers of 6-thiopurine in low-temperature Ar matrices: FTIR spectroscopy analysis and quantum mechanical calculations. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, 48(4), 340–350. https://doi.org/10.1063/10.0009734