@inproceedings{pavel2010high-energy,
title={High-energy asymptotics of the spectrum of a periodic square lattice quantum graph},
author={Pavel Exner, and Ondej Turek},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020133433549416739},
booktitle={Journal of Physics A: Mathematical and Theoretical},
volume={43},
number={47},
pages={474024},
year={2010},
}

Pavel Exner, and Ondej Turek. High-energy asymptotics of the spectrum of a periodic square lattice quantum graph. 2010. Vol. 43. In Journal of Physics A: Mathematical and Theoretical. pp.474024. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020133433549416739.