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Translated from Ukrainskii Matematicheskii Zhurnal, Vol.21, No.4, pp. 108–113, July–August, 1968.
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Vasilishin, S.A., Fodchuk, V.I. The construction of asymptotic solutions for quasi-linear partial differential equations with retarded time argument. Ukr Math J 19, 473–477 (1967). https://doi.org/10.1007/BF01090407
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DOI: https://doi.org/10.1007/BF01090407