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Translated from Sibirskii Matematicheskii Zhurmal, Vol. 10, No. 2, pp. 373–385, March–April 1969.
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Liskovets, O.A. Incorrectly posed problems and stability of quasisolutions. Sib Math J 10, 266–274 (1969). https://doi.org/10.1007/BF00970438
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DOI: https://doi.org/10.1007/BF00970438