@inproceedings{shing-tung1992obstacle,
title={Obstacle problem for von Karman equations},
author={Shing-Tung Yau, and Yang Gao},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224204052417411127},
booktitle={Advances in Applied Mathematics},
volume={13},
number={2},
pages={123-141},
year={1992},
}

Shing-Tung Yau, and Yang Gao. Obstacle problem for von Karman equations. 1992. Vol. 13. In Advances in Applied Mathematics. pp.123-141. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224204052417411127.