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Additional information
Novosibirsk. Yakutsk. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 25, No. 5, pp. 9–19, September–October, 1984.
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Grigor'ev, Y.M., Naumov, V.V. Approximation theorems for the Moisil-Theodorescu system. Sib Math J 25, 693–701 (1984). https://doi.org/10.1007/BF00968681
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DOI: https://doi.org/10.1007/BF00968681