1. E. Fitzer and B. Terewiesh, Carbon, 11 (1975) 570.
2. K. J. Huttinger and U. Rosenblatt, in Proceedings of the 4th Conference on Industrial Carbon and Graphite, London, 1974 (Society of Chemical Industry, London, 1976).
3. Idem, Carbon, 15 (1977) 69.
4. R. L. Burns and J. L. Cook, in “Pressure carbonisation of petroleum pitches”, Vol. 21, edited by M. L. Deviney and T. M. O'Grady (American Chemical Society, Washington, 1974), p. 139.
5. W. Chard, M. Conaway and D. Neisz, ibidin, p. 155.