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Additional information
Alma-Ata. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 32, No. 3, pp. 141–150, May–June, 1991.
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Serovaiskii, S.Y. Necessary and sufficient optimality conditions for a system described by a nonlinear elliptic equation. Sib Math J 32, 468–476 (1991). https://doi.org/10.1007/BF00970485
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DOI: https://doi.org/10.1007/BF00970485