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Soviet Physics—Uspekhi
J. Opt. Soc. Am. 51(1) 119_1-119 (1961)
Soviet Physics—USPEKHI
J. Opt. Soc. Am. 52(12) 1411_2-1412 (1962)
Technical Notes
J. Opt. Soc. Am. 51(8) 921-924 (1961)