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Minsk. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 26, No. 3, pp. 78–90, May–June, 1985.
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Kruger, A.Y. Generalized differentials of nonsmooth functions, and necessary conditions for an extremum. Sib Math J 26, 370–379 (1985). https://doi.org/10.1007/BF00968624
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DOI: https://doi.org/10.1007/BF00968624