@inproceedings{kefeng2011a,
  title={A note on modular forms and generalized anomaly cancellation formulas},
  author={Kefeng Liu, and Yong Wang},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191221111524545948657},
  booktitle={arXiv preprint arXiv:1109.5794},
  year={2011},
}