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Potapov, M. K.; Berisha, F. M. Direct and inverse theorems of approximation theory for a generalized modulus of smoothness. (English) Zbl 0957.41009 Anal. Math. 25, No. 3, 187-203 (1999). Reviewer: Ion Badea (Craïova) MSC: 41A25 PDF BibTeX XML Cite \textit{M. K. Potapov} and \textit{F. M. Berisha}, Anal. Math. 25, No. 3, 187--203 (1999; Zbl 0957.41009) Full Text: DOI arXiv