@inproceedings{pavel1989one,
title={One more theorem on the shorttime regeneration rate},
author={Pavel Exner},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020131016517739664},
booktitle={Journal of Mathematical Physics},
volume={30},
number={11},
pages={2563-2564},
year={1989},
}

Pavel Exner. One more theorem on the shorttime regeneration rate. 1989. Vol. 30. In Journal of Mathematical Physics. pp.2563-2564. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020131016517739664.