1. N. G. Dovaston, B. McEnaney and S. M. Rowan, Proc. 3rd Conference on Industrial Carbon and Graphite. SCI London p. 212, (1971).
2. J. J. Kipling, J. N. Sherwood, P. V. Shooter and N. R. Thompson, Carbon 1, 321, (1964).
3. E. Greenhalgh, J. B. Miles, E. Redman and S. A. Sharman, Proc.2nd Conference on Industrial Carbon and Graphite, SCI London p. 405, (1966).
4. A. L. Sutton and V. C. Howard, J.Nuclear Materials, 1, 58, (1962).
5. J. Nagle and R. F. Strickland-Constable, Proc. 5th Conference on Carbon, Vol.1, Pergamon London p. 154, (1962).