1. Enzo, S., Mulas, G., Delogu, F., and Principi, G., J. Mater. Synth. Proc., 2000, vol. 8, nos.5–6, p. 313.
2. Sarkar, S. and Bansal, C., J. Alloys Comp., 2002, vol. 334, no.2, p. 135.
3. Morris, M.A. and Morris, D.G., Mater. Sci. Forum, 1992, vol. 88/90, no.5, p. 529.
4. Oleszak, D., Pekata, M., Jartych, E., and Zurawicz, J.K., Mater. Sci. Forum, 1997, vol. 269/272, no.6, p. 643.
5. Grigor’eva, T.F., Barinova, A.P., and Lyakhov, N.Z., Usp. Khim., 2001, vol. 70, no.1, p. 53.