@inproceedings{kefeng1996on,
title={On elliptic genera and theta-functions},
author={Kefeng Liu},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191221111254622648613},
booktitle={Topology},
volume={35},
number={3},
pages={617-640},
year={1996},
}

Kefeng Liu. On elliptic genera and theta-functions. 1996. Vol. 35. In Topology. pp.617-640. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191221111254622648613.