@inproceedings{pavel1969on,
title={On S-transformation in the strong coupling theory},
author={Pavel Exner, and J Tolar},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020135043645009790},
booktitle={Czechoslovak Journal of Physics B},
volume={19},
number={12},
pages={1480-1485},
year={1969},
}
Pavel Exner, and J Tolar. On S-transformation in the strong coupling theory. 1969. Vol. 19. In Czechoslovak Journal of Physics B. pp.1480-1485. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020135043645009790.