@inproceedings{g.1957denumerable,
title={Denumerable Markov processes and the associated contraction semigroups on$l$},
author={G. E. H. Reuter},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203146264743842},
booktitle={Acta Mathematica},
volume={97},
number={1},
pages={1-46},
year={1957},
}
G. E. H. Reuter. Denumerable Markov processes and the associated contraction semigroups on$l$. 1957. Vol. 97. In Acta Mathematica. pp.1-46. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203146264743842.