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Translated fromSibirskiî Matematicheskiî Zhurnal, Vol. 35, No. 2, pp. 359–376, March–April, 1994.
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Kozhanov, A.I. Boundary value problems for some classes of higher-order equations that are unsolved with respect to the highest derivative. Sib Math J 35, 324–340 (1994). https://doi.org/10.1007/BF02104779
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DOI: https://doi.org/10.1007/BF02104779