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Translated from Zapiski Nauchnykh Seminarov Leningradskogo Instituta im. V. A. Steklova Akademii Nauk SSSR, Vol. 34, pp. 23–51, 1973.
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Babich, V.M. Rigorous justification of the shortwave approximation in the three-dimensional case. J Math Sci 6, 488–509 (1976). https://doi.org/10.1007/BF01086730
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DOI: https://doi.org/10.1007/BF01086730