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V. N. Gabushin, “On the best approximation of the differentiation operator on the half line,” Mat. Zametki,6, No. 5, 573–582 (1969).
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Translated from Matematicheskie Zametki, Vol. 41, No. 3, pp. 313–319, March, 1987.
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Kuptsov, N.P. Exact constants in the inequalities between norms of functions and their derivatives. Mathematical Notes of the Academy of Sciences of the USSR 41, 178–182 (1987). https://doi.org/10.1007/BF01158244
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DOI: https://doi.org/10.1007/BF01158244