中国科学院数学与系统科学研究院期刊网
AMS
Bounds for Hardy Type Differences
Neven ELEZOVIĆ, Kristina KRULIĆ, JosipPEČARIĆ
Acta Mathematica Sinica . 2011, (4): 671 -684 .  DOI: 10.1007/s10114-011-9707-5