中国科学院数学与系统科学研究院期刊网
AMS
The Iyengar Type Inequalities with Exact Estimations and the Chebyshev Central Algorithms of Integrals
Xing Hua WANG, Shi Jun YANG
Acta Mathematica Sinica . 2005, (6): 1361 -1376 .  DOI: 10.1007/s10114-005-0578-5