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Additional information
Institute of Cybernetics, Ukrainian Academy of Sciences, Kiev. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 27, No. 3, pp. 79–82, July–September, 1993.
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Mel'nik, V.S. On weak solutions of operator equations. Funct Anal Its Appl 27, 213–215 (1993). https://doi.org/10.1007/BF01087540
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DOI: https://doi.org/10.1007/BF01087540