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Milovanović, I.Ž., Stojanović, N.M., Toader, G. et al. On representation of a linear operator on the set of mean-convex sequences. Period Math Hung 25, 127–131 (1992). https://doi.org/10.1007/BF02113169
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DOI: https://doi.org/10.1007/BF02113169