A. V. Dezhenkov, M. V. Tankevich, E. D. Nikolskaya, I. P. Smirnov, G. E. Pozmogova, V. I. Shvets, Yu. G. Kirillova, “Synthesis of anionic peptide nucleic acid oligomers including γ-carboxyethyl thymine monomers”, Mendeleev Commun., 25:1 (2015), 47–48