@inproceedings{huaning2006hybrid,
title={Hybrid mean value on the difference between an integer and its inverse modulo$q$},
author={Huaning Liu, and Wenpeng Zhang},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203622797916940},
booktitle={Arkiv for Matematik},
volume={46},
number={2},
pages={337-347},
year={2006},
}
Huaning Liu, and Wenpeng Zhang. Hybrid mean value on the difference between an integer and its inverse modulo$q$. 2006. Vol. 46. In Arkiv for Matematik. pp.337-347. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203622797916940.