中国科学院数学与系统科学研究院期刊网
AMS
A Generalization on the Difference Between an Integer and Its Inverse Modulo Q
Tian Ping ZHANG, Wen Peng ZHANG
Acta Mathematica Sinica . 2008, (2): 215 -222 .  DOI: 10.1007/s10114-007-0942-8