@inproceedings{pavel2018quantum,
title={Quantum graphs with vertices of a preferred orientation},
author={Pavel Exner, and Milo Tater},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020134521826625772},
booktitle={Physics Letters A},
volume={382},
number={5},
pages={283-287},
year={2018},
}
Pavel Exner, and Milo Tater. Quantum graphs with vertices of a preferred orientation. 2018. Vol. 382. In Physics Letters A. pp.283-287. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020134521826625772.