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2. Martens, H. E., Button, D. D., Fischbach, D. B., and Jaffe, L. D., Proc. Fourth Conf. Carbon, 511 (Pergamon Press, London, 1960).
3. Kotlensky, W. V. (unpublished results).
4. Green, jun., L., Proc. Fourth Conf. Carbon, 497 (Pergamon Press, London, 1960).
5. Kotlensky, W. V., and Martens, H. E., Proc. Fifth Conf. Carbon (Pergamon Press, London) (in the press).