1. Hennig, G. R., Proc. Third Conf. Carbon, 265 (Pergamon Press, 1959).
2. Dienes, G. J., Hennig, G. R., and Ksoiba, W., Proc. Second Intern. Conf. Peaceful Uses of Atomic Energy, Geneva, Paper No. 1778, (1958).
3. Hennig, G. R., and Kanter, M. A., Proc. Fourth Conf. Carbon, 141 (Pergamon Press, 1960).
4. Hennig, G. R., ibid, 145.
5. Hennig, G. R., J. Chim. Physique, 58, 12 (1960).