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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 34, No. 1, pp. 116–118, January–February, 1982.
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Malovichko, V.A. Theory of boundary-value problems for singular hyperbolic equations. Ukr Math J 34, 99–101 (1982). https://doi.org/10.1007/BF01086144
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DOI: https://doi.org/10.1007/BF01086144