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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 32, No. 3, pp. 405–409, May–June, 1980.
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Samoilenko, V.G. Elliptic operators of second order with an infinite number of variables. Ukr Math J 32, 273–276 (1980). https://doi.org/10.1007/BF01089770
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DOI: https://doi.org/10.1007/BF01089770