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Moscow. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 26, No. 4, pp. 11–21, July–August, 1985.
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Bobylev, N.A. Stability of classical solutions of variational problems of mathematical physics. Sib Math J 26, 485–493 (1985). https://doi.org/10.1007/BF00971295
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DOI: https://doi.org/10.1007/BF00971295