@inproceedings{ulf1961stochastic,
title={Stochastic groups},
author={Ulf Grenander},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203425218130966},
booktitle={Arkiv for Matematik},
volume={4},
number={2},
pages={163-183},
year={1961},
}