中国科学院数学与系统科学研究院期刊网
The Best Approximation Rate of Certain Trigonometric Series Important Applications of a "Two-sided" Monotonicity Condition
Song Ping ZHOU(1), Rui Jun LE(
Acta Mathematica Sinica, Chinese Series . 2006, (3): 509 -518 .  DOI: 10.12386/A2006sxxb0064