1. S. Mrozowski, Proceedings of the Conference on Carbon (Pergamon Press, Oxford and New York, 1959) p. 495.
2. A. Oberlin and F. Rousseaux, Acad. Sci. Paris 274 (1973) 108.
3. K. Kobayashi, M. Shiraishi and K. Suzuki, Tanso 74 (1973) 83.
4. G. M. Jenkins, K. Kawamura, ?Polymeric Carbon-Carbon Fibre, Glass and Char? (Cambridge University Press, Cambridge, 1976) p. 83.
5. S. Mrozowski, Phys. Rev. 85 (1952) 609; Errata, 86 (1952) 1056.