1. Kharchenko, V.G., Chalaya, S.N., and Konovalova, T.M.,Tiopirany i soli tiopiriliya (Thiopyrans and Salts of Thiopyrilium), Saratov: Saratov. Gos. Univ., 1975.
2. Kharchenko, V.G. and Chalaya, S.N.,Tiopirany, soli tiopiriliya i rodstvennye soedineniya (Thiopyrans, Thiopyrilium Salts, and Related Compounds), Saratov: Saratov. Gos. Univ., 1987, p. 13.
3. Kharchenko, V.G. and Chalaya, S.N.,1,5-diketony (1.5Diketones), Saratov: Saratov. Gos. Univ., 1977, p. 72.
4. Fomenko, L.A.,Cand. Sci. (Chem.) Dissertation, Saratov: Saratov. State Univ., 1995, p. 3.
5. Pokhodenko, V.D., Beloded, A.A., and Koshechko, V.G.,Okislitel’no-vosstanovitel’nye reaktsii svobodnykh radikalov (Redox Reactions Involving Free Radicals), Kiev: Naukova Dumka, 1977, p. 95.