1. Savelova, V.A., Popov, A.F., Solomoichenko, T.N., Sadovskii, Yu.S., Piskunova, Zh.P., and Lobanova, O.V., Russ. J. Org. Chem., 2000, vol. 36, p. 1465.
2. Dneprovskii, A.S. and Temnikova, T.I., Teoreticheskie osnovy organicheskoi khimii (Theoretical Foundations of Organic Chemistry), Leningrad: Khimiya, 1991.
3. Kirksey, C.H. and Hambright, P., Inorg. Chem., 1970, vol. 9, p. 958.
4. Kirksey, C.H., Hambright, P., and Storm, C.B., Inorg. Chem., 1969, vol. 8, p. 2141.
5. Szintay, G. and Horvath, A., Inorg. Chim. Acta, 2000, vol. 310, p. 175.