@inproceedings{weinan1996vorticity,
title={Vorticity boundary condition and related issues for finite difference schemes},
author={Weinan E, and Jian-Guo Liu},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170209133543705146405},
booktitle={Journal of Computational Physics},
volume={124},
number={2},
pages={368-382},
year={1996},
}
Weinan E, and Jian-Guo Liu. Vorticity boundary condition and related issues for finite difference schemes. 1996. Vol. 124. In Journal of Computational Physics. pp.368-382. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170209133543705146405.