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Additional information
Translated from Sibirskii Matematicheskii Zhurnal, Vol. 25, No. 4, pp. 107–110, July–August, 1984.
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Kusraev, A.G. Subdifferential of a sum. Sib Math J 25, 595–598 (1984). https://doi.org/10.1007/BF00968898
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DOI: https://doi.org/10.1007/BF00968898