Goodrich, Christopher S. A note on convexity, concavity, and growth conditions in discrete fractional calculus with delta difference. (English) Zbl 1337.26011 Math. Inequal. Appl. 19, No. 2, 769-779 (2016). MSC: 26A33 26A51 39A70 PDFBibTeX XMLCite \textit{C. S. Goodrich}, Math. Inequal. Appl. 19, No. 2, 769--779 (2016; Zbl 1337.26011) Full Text: DOI Link
Popa, Emil C. A certain class of approximation operators. (English) Zbl 1153.41308 Math. Inequal. Appl. 8, No. 4, 699-703 (2005). Reviewer: Ganesh Datta Dikshit (Auckland) MSC: 41A36 41A25 05A40 PDFBibTeX XMLCite \textit{E. C. Popa}, Math. Inequal. Appl. 8, No. 4, 699--703 (2005; Zbl 1153.41308)