@inproceedings{pavel1982uniform,
title={Uniform product formulae with application to the FeynmanNelson integral for open systems},
author={Pavel Exner, and GI Kolerov},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020130743492180655},
booktitle={Letters in Mathematical Physics},
volume={6},
number={2},
pages={153-159},
year={1982},
}

Pavel Exner, and GI Kolerov. Uniform product formulae with application to the FeynmanNelson integral for open systems. 1982. Vol. 6. In Letters in Mathematical Physics. pp.153-159. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020130743492180655.