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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 18, No. 4, pp. 926–933, July–August, 1977.
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Baranovskii, F.T. The Cauchy problem for a hyperbolic equation degenerating on the initial plane with altered initial data. Sib Math J 18, 658–663 (1977). https://doi.org/10.1007/BF00967209
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DOI: https://doi.org/10.1007/BF00967209