@inproceedings{pavel2015spectrum,
title={Spectrum of a dilated honeycomb network},
author={Pavel Exner, and Ondej Turek},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020132712204527716},
booktitle={Integral Equations and Operator Theory},
volume={81},
number={4},
pages={535-557},
year={2015},
}

Pavel Exner, and Ondej Turek. Spectrum of a dilated honeycomb network. 2015. Vol. 81. In Integral Equations and Operator Theory. pp.535-557. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020132712204527716.