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2. Industrial Graphite Engineering Handbook, Union Carbide Corp. (1959).
3. S. V. Shulepov, É. A. Smirnova, and V. N. Plechev, in: Proceedings of Chelyabinsk Pedagogical Institute, Vol. 2, Chelyabinskii Pedinstitut (1964).
4. W. H. Reynolds and J. H. W. Simmons, Proc. 5th Conf. Carbon, Vol. 1, Pergamon (1962).
5. B. T. Kelly, Phil. Mag.,9 (1964).