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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 39, No. 5, pp. 583–587, September–October, 1987.
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Naiko, D.A. Approximation of the derivatives of some combinations of operators of class B. Ukr Math J 39, 473–477 (1987). https://doi.org/10.1007/BF01066458
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DOI: https://doi.org/10.1007/BF01066458