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Reference9 articles.
1. Colwell, R. C., and Friend, A. W., NATURE, 144, 31 (1939).
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3. Piddington, J. H., Proc. Phys. Soc., 51, 129 (1939).
4. Englund, C. R., Crawford, A. B., and Mumford, W. W., Bell Syst. Tech. J., 17, 489 (1938).
5. See for example, Wilcken, J. A., Phil. Mag., 49, 107 (1925). Rawer K., Ann. Phys., 35, 385 (1939).