@inproceedings{shing-tung1999spanning, title={Spanning trees in subgraphs of lattices}, author={Shing-Tung Yau, and ST Yau}, url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224204652410716204}, booktitle={Contemporary Mathematics}, volume={245}, pages={201-220}, year={1999}, }