Liu, Zheng On extensions of Steffensen’s inequality. (English) Zbl 1204.26038 J. Math. Anal. Approx. Theory 2, No. 2, 132-139 (2007). Cited in 4 Documents MSC: 26D15 Inequalities for sums, series and integrals PDF BibTeX XML Cite \textit{Z. Liu}, J. Math. Anal. Approx. Theory 2, No. 2, 132--139 (2007; Zbl 1204.26038)