中国科学院数学与系统科学研究院期刊网
AMS
Mean Value on the Difference Between a Quadratic Residue and Its Inverse Modulo p
Hua Ning LIU, Wen Peng ZHANG
Acta Mathematica Sinica . 2007, (5): 915 -924 .  DOI: 10.1007/s10114-005-0847-3