1. Tkachenko, L.A., Shaulov, A.Yu., and Berlin, A.A., Inorg. Mater., 2012, vol. 48, no. 3, pp. 213–221.
2. Ban’kovskaya, I.B., Gorbatova, G.N., Sazonova, M.V., and Filipovich, V.N., Zh. Prikl. Khim., 1997, vol. 70, no. 11, pp. 1907–1910.
3. Mashnitskii, A.A., USSR Inventor’s Certificate no. 268120, 1970.
4. Cairo, C.A.A., Graca, M.L.A., Silva, C.R.M., and Bressiani, J.C., J. Eur. Ceram. Soc., 2001, vol. 21, no. 3, pp. 325–329.
5. Fergus, J.W. and Worrell, W.L., Carbon, 1995, vol. 33, pp. 534–543.