@inproceedings{pavel2012spectral,
title={Spectral estimates for a class of Schrdinger operators with infinite phase space and potential unbounded from below},
author={Pavel Exner, and Diana Barseghyan},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020131858797999690},
booktitle={Journal of Physics A: Mathematical and Theoretical},
volume={45},
number={7},
pages={075204},
year={2012},
}
Pavel Exner, and Diana Barseghyan. Spectral estimates for a class of Schrdinger operators with infinite phase space and potential unbounded from below. 2012. Vol. 45. In Journal of Physics A: Mathematical and Theoretical. pp.075204. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020131858797999690.