References
- W.T. Scott -The Physics of Electricity and Magnetism}. J. Wiley & S., Inc., 1959, pp. 635Google Scholar
- L. Brillouin -La Science et la Theorie de l’Information. Ed. Massons & Cie. Paris, 1959, pp..302, Fr. 4800MATHGoogle Scholar
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© Società Italiana di Fisica 1960