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Translated from Matematicheskie Zametki, Vol. 48, No. 6, pp. 91–97, December, 1990.
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Svinolupov, S.I., Sokolov, V.V. Weak nonlocalities in evolution equations. Mathematical Notes of the Academy of Sciences of the USSR 48, 1234–1239 (1990). https://doi.org/10.1007/BF01240266
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DOI: https://doi.org/10.1007/BF01240266