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Yaroslavl'. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 33, No. 3, pp. 91–100, May–June, 1992.
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Klimov, V.S. Minimax critical values of nonsmooth functionals. Sib Math J 33, 445–452 (1992). https://doi.org/10.1007/BF00970892
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DOI: https://doi.org/10.1007/BF00970892