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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 29, No. 2, pp. 181–193, March–April, 1977.
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Martynyuk, A.E. Application of Galerkin methods to the fundamental boundary-value problems for weakly elliptic equations. Ukr Math J 29, 135–145 (1977). https://doi.org/10.1007/BF01089239
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DOI: https://doi.org/10.1007/BF01089239