@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},
}

Lavi Karp, and Erik Lundberg. A four-dimensional Neumann ovaloid. 2017. Vol. 55. In Arkiv for Matematik. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20180301170914906639950.