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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 36, No. 3, pp. 275–282, May–June, 1984.
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Baranovskii, F.T. Cauchy problem for a hyperbolic equation with degenerate principal part. Ukr Math J 36, 247–253 (1984). https://doi.org/10.1007/BF01077455
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DOI: https://doi.org/10.1007/BF01077455