@inproceedings{claes1976on,
title={On the instability of capacity},
author={Claes Fernström},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203501536355274},
booktitle={Arkiv for Matematik},
volume={15},
number={1},
pages={241-252},
year={1976},
}