@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}, }