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This work was carried out while visiting at the University of Thessaloniki under the Erasmus program, project No. ICP-93-D-1260/17.
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Danikas, N., Ruscheweyh, S. & Siskakis, A.G. Metrical and topological properties of a generalized Libera transform. Arch. Math 63, 517–524 (1994). https://doi.org/10.1007/BF01202067
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DOI: https://doi.org/10.1007/BF01202067