@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}, }