@inproceedings{åsvald1979on,
title={On extreme operators on finite-dimensional Banach spaces whose unit balls are polytopes},
author={Åsvald Lima},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203509732341345},
booktitle={Arkiv for Matematik},
volume={19},
number={1},
pages={97-116},
year={1979},
}
Åsvald Lima. On extreme operators on finite-dimensional Banach spaces whose unit balls are polytopes. 1979. Vol. 19. In Arkiv for Matematik. pp.97-116. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203509732341345.