@inproceedings{j.1969on,
title={On a conjecture of V. Bernstein},
author={J. R. Shackell},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203443630288123},
booktitle={Arkiv for Matematik},
volume={8},
number={1},
pages={83-101},
year={1969},
}