Barnett, N. S. ., P. . Cerone, and S. S. . Dragomir. “A Sharp Bound for the Error in the Corrected Trapezoid Rule and Application”. Tamkang Journal of Mathematics, vol. 33, no. 3, Sept. 2002, pp. 253-8, doi:10.5556/j.tkjm.33.2002.253-258.