1. Blackman, L., Dundas, P., and Ubbelohde, A. R., Proc. Roy. Soc., A, 255, 293 (1960).
2. Ubbelohde, A. R., Proc. Conf. Carbon (in the press).
3. Ubbelohde, A. R., and Lewis, F. A., Graphite and its Crystal Gompounds (Oxford Univ. Press, 1960).
4. Blackman, L., Dundas, P., Moore, A. W., and Ubbelohde, A. R., Brit. J. App. Phys., 12, 377 (1961).
5. Kingery, W. D., Proc. Fourth Carbon Conf., Buffalo, 457 (Pergamon Press, 1960).