@inproceedings{k.1969to,
title={To reverse a Markov process},
author={K. L. Chung, and John B. Walsh},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203218710815083},
booktitle={Acta Mathematica},
volume={123},
number={1},
pages={225-251},
year={1969},
}