@inproceedings{bo1967high,
title={High submodules and purity},
author={Bo T. Stenström},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203438545657078},
booktitle={Arkiv for Matematik},
volume={7},
number={2},
pages={173-176},
year={1967},
}