@inproceedings{n.1986on,
title={On an example of Wermer},
author={N. Levenberg},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203526531575483},
booktitle={Arkiv for Matematik},
volume={26},
number={1},
pages={155-163},
year={1986},
}