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1.Galperin, G. I.Spectral, Electro-photometrical and Radar Researches of aurora and airglow, IGY series, problem IV, Acad. Sci. U.S.S.R., Moscow, No. 1, 7, 1959.Google Scholar
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2.Mironov, A. V., Prokudina, V. S. and Shefov, N. N.Ibid., No. 1, 20, 1959.Google Scholar