Literature cited
G. A. Ancliffe, Brit. J. Appl. Phys.,16, no. 10, 1467, 1965;17, no. 3, 327, 1966.
N. A. Vlasenko and Yu. A. Popkov, Opt. i spektr.,8, 81–88, 1960.
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Translated from Izvestiya VUZ. Fizika, Vol. 11, No. 11, pp. 145–147, November, 1968.