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Translated from Kibernetika, No. 3, pp. 66–71, May–June, 1985.
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Khachatryan, R.A. Necessary conditions for an extremum in nonsmooth optimal control problems with discrete time. Cybern Syst Anal 21, 356–363 (1985). https://doi.org/10.1007/BF01078831
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DOI: https://doi.org/10.1007/BF01078831