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Additional information
Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, radiofizika, Vol. 20, No. 3, pp. 383–398, March, 1977.
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Naida, O.N. Uniform geometrical-optics approximation of linear systems a long rays of variable multiplicity. Radiophys Quantum Electron 20, 261–271 (1977). https://doi.org/10.1007/BF01039468
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DOI: https://doi.org/10.1007/BF01039468