Dinh-Dung On recovery of functions by sampling series. (English) Zbl 0732.41019 C. R. Acad. Bulg. Sci. 43, No. 1, 25-27 (1990). Reviewer: W.Splettstößer (Kaarst) MSC: 41A30 41A27 PDFBibTeX XMLCite \textit{Dinh-Dung}, C. R. Acad. Bulg. Sci. 43, No. 1, 25--27 (1990; Zbl 0732.41019)
Drianov, D. P. Average modulus of smoothness of fractional index and applications. (English) Zbl 0515.41016 C. R. Acad. Bulg. Sci. 36, 41-43 (1983). MSC: 41A25 41A27 42A10 PDFBibTeX XMLCite \textit{D. P. Drianov}, C. R. Acad. Bulg. Sci. 36, 41--43 (1983; Zbl 0515.41016)
Totkov, G. A. Converse theorems for onesided spline approximation. (English) Zbl 0463.41013 C. R. Acad. Bulg. Sci. 32, 875-878 (1979). MSC: 41A27 41A15 41A50 65D07 PDFBibTeX XMLCite \textit{G. A. Totkov}, C. R. Acad. Bulg. Sci. 32, 875--878 (1979; Zbl 0463.41013)