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Literature Cited
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Yaroslavl' State University. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 24, No. 1, pp. 79–88, January–February, 1983.
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Zabreiko, P.P., Tikhonov, V.P. Determining equations and the duality principle. Sib Math J 24, 65–72 (1983). https://doi.org/10.1007/BF00968797
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DOI: https://doi.org/10.1007/BF00968797