1. US-Pat. 568 323 (1985).
2. and in and : Chemische Technologie. Vol. I, 3rd. Edit., Hanser, M�nchen 1969.
3. : Physical Properties of Graphite. Elsevier, Amsterdam 1968.
4. The deposition of pyrolytic graphite
5. and : Les Pyrocarbones in Les Carbones. Vol. 2, p. 779; Masson, Paris 1965.