@inproceedings{ren2009rigidity, title={Rigidity of polyhedral surfaces, II}, author={Ren Guo, and Feng Luo}, url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224205809820791348}, booktitle={Geometry & Topology}, volume={13}, number={3}, pages={1265-1312}, year={2009}, }