@inproceedings{lavi2017a,
title={A four-dimensional Neumann ovaloid},
author={Lavi Karp, and Erik Lundberg},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20180301170914906639950},
booktitle={Arkiv for Matematik},
volume={55},
year={2017},
}