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Translated from Matematicheskie Zametki, Vol. 29, No. 5, pp. 731–742, May, 1981.
The author thanks V. M. Tikhomirov for his interest and assistance.
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Buslaev, A.P. Approximation of a differentiation operator. Mathematical Notes of the Academy of Sciences of the USSR 29, 372–378 (1981). https://doi.org/10.1007/BF01158361
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DOI: https://doi.org/10.1007/BF01158361