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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 11, No. 5, pp. 1009–1016, September–October, 1970.
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Ivanov, V.K. Unstable linear problems with many-valued operators. Sib Math J 11, 751–756 (1970). https://doi.org/10.1007/BF00967835
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DOI: https://doi.org/10.1007/BF00967835