DRAGOMIR, SEVERS, and SONG WANG. “APPLICATIONS OF IYENGAR’S TYPE INEQUALITIES TO THE ESTIMATION OF ERROR BOUNDS FOR THE TRAPEZOIDAL QUADRATURE RULE”. Tamkang Journal of Mathematics 29, no. 1 (March 1, 1998): 55–58. Accessed May 19, 2024. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4299.