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3. Dr. Th. Chvatal, Sprechsaal fuer Keramik, Glas, Email, u. Silikate, No. 20, 903?915 (1966).
4. Dr. Th. Chvatal, in: International Ceramic Congress, Stockholm, Sweden, June 12?18, 1966. Vienna (1966), p. 377.
5. G. P. Novoselov and A. T. Ageenkov, At. Energ.,26, 230?234 (1969).