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Translated from Matematicheskie Zametki, Vol. 37, No. 2, pp. 192–199, February, 1985.
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Kryazhimskii, A.V., Osipov, Y.S. Best approximation of the differentiation operator in the class of nonanticipatory operators. Mathematical Notes of the Academy of Sciences of the USSR 37, 109–114 (1985). https://doi.org/10.1007/BF01156754
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DOI: https://doi.org/10.1007/BF01156754