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Additional information
Moscow Energy Institute. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 24, No. 11, pp. 1383–1391, November, 1981.
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Orlov, Y.I., Tropkin, S.K. Broadened penumbra caustics. Radiophys Quantum Electron 24, 936–942 (1981). https://doi.org/10.1007/BF01035330
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DOI: https://doi.org/10.1007/BF01035330