@inproceedings{pavel1981feynman,
title={Feynman maps without improper integrals},
author={Pavel Exner, and GI Kolerov},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020134945477427788},
booktitle={Czechoslovak Journal of Physics B},
volume={31},
number={11},
pages={1207-1224},
year={1981},
}
Pavel Exner, and GI Kolerov. Feynman maps without improper integrals. 1981. Vol. 31. In Czechoslovak Journal of Physics B. pp.1207-1224. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020134945477427788.