1. Akhrem, I.S. and Vol’pin, M.E., Usp. Khim., 1990, vol. 59, p. 1906.
2. Zhorov, Yu.M., Termodinamika khimicheskikh protsessov (Thermodynamics of Chemical Processes), Moscow: Khimiya, 1985, p. 135.
3. Bulgakov, R.G., Kuleshov, S.P., Karamzina, D.S., Makhmutov, A.R., Vafin, R.R., Shestopal, Ya.L., Mullagaliev, I.R., Monakov, Yu.B., and Dzhemilev, U.M., Kinet. Katal., 2006, vol. 47, p. 760.
4. Yatsimirskii, B.K., Kostromina, N.A., Sheka, Z.A., Davidenko, N.K., Kriss, E.E., and Ermolenko, V.I., Khimiya kompleksnykh soedinenii redkozemel’nykh elementov (Chemistry of Rare-Earth Coordination Compounds), Kiev: Naukova Dumka, 1966, p. 493.
5. Gordon, A.J. and Ford, R.A., The Chemist’s Companion, New York: Wiley, 1972.