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Kiev Polytechnical Institute, Kiev. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 20, No. 3, pp. 479–492, May–June, 1979.
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Baranovskii, F.T. Mixed problem for a second-order hyperbolic equation which is strongly degenerate on the initial plane. Sib Math J 20, 338–346 (1979). https://doi.org/10.1007/BF00969936
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DOI: https://doi.org/10.1007/BF00969936