中国科学院数学与系统科学研究院期刊网
AMS
Some Identities Involving Certain Hardy Sums and Ramanujan Sum
Hong Yan LIU, Wen Peng ZHANG
Acta Mathematica Sinica . 2005, (1): 109 -116 .  DOI: 10.1007/s10114-004-0345-z