@inproceedings{d2004exponential,
title={Exponential splitting of bound states in a waveguide with a pair of distant windows},
author={D Borisov, and Pavel Exner},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020122751463387570},
booktitle={Journal of Physics A: Mathematical and General},
volume={37},
number={10},
pages={3411},
year={2004},
}
D Borisov, and Pavel Exner. Exponential splitting of bound states in a waveguide with a pair of distant windows. 2004. Vol. 37. In Journal of Physics A: Mathematical and General. pp.3411. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020122751463387570.