@inproceedings{tobias2004minimizing,
title={Minimizing singularities of generic plane disks with immersed boundaries},
author={Tobias Ekholm, and Ola Larsson},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203614824514870},
booktitle={Arkiv for Matematik},
volume={43},
number={2},
pages={347-364},
year={2004},
}
Tobias Ekholm, and Ola Larsson. Minimizing singularities of generic plane disks with immersed boundaries. 2004. Vol. 43. In Arkiv for Matematik. pp.347-364. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203614824514870.