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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 25, No. 3, pp. 62–70, May–June, 1984.
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Gorokhovik, V.V. Quasidifferentiability of real-valued functions and local extremum conditions. Sib Math J 25, 388–395 (1984). https://doi.org/10.1007/BF00968978
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DOI: https://doi.org/10.1007/BF00968978