@inproceedings{yong2013nodal, title={Nodal geometry of graphs on surfaces}, author={Yong Lin, Gbor Lippner, Dan Mangoubi, and Shing-Tung Yau}, url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224204711554393209}, booktitle={arXiv preprint arXiv:1307.3226}, year={2013}, }