1. W. E. Rowe and J. R. Johnson. Electrical Manufacturing. August (1959), pp. 93?97.
2. D. T. Livey. Trans. Brit. Ceram. Soc.,56, No. 9 (1957), pp. 482?498.
3. ?Atomes,? No. 168 (1960), pp. 237?240.
4. V. S. Belevantsev. Graphic symposium on information. Silicate Materials, No. 1, Information (1960);
5. Silicate Materials, No. 1 (in Russian) (1960).