@inproceedings{kôhei2008the,
title={The hitting distributions of a half real line for two-dimensional random walks},
author={Kôhei Uchiyama},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203628102854985},
booktitle={Arkiv for Matematik},
volume={48},
number={2},
pages={371-393},
year={2008},
}

Kôhei Uchiyama. The hitting distributions of a half real line for two-dimensional random walks. 2008. Vol. 48. In Arkiv for Matematik. pp.371-393. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203628102854985.