@inproceedings{taksu2003persistent,
title={Persistent currents due to point obstacles},
author={Taksu Cheon, and Pavel Exner},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020133820475443752},
booktitle={Physics Letters A},
volume={307},
number={4},
pages={209-214},
year={2003},
}