@inproceedings{lai1993on,
title={On the size of graphs with all cycle having distinct length},
author={Lai Chunhui},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20161227084359716230693},
booktitle={Discrete Mathematics},
volume={122},
pages={363-364},
year={1993},
}

Lai Chunhui. On the size of graphs with all cycle having distinct length. 1993. Vol. 122. In Discrete Mathematics. pp.363-364. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20161227084359716230693.