@inproceedings{g.1987rearrangements,
title={Rearrangements of functions, saddle points and uncountable families of steady configurations for a vortex},
author={G. R. Burton},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203313459920438},
booktitle={Acta Mathematica},
volume={163},
number={1},
pages={291-309},
year={1987},
}
G. R. Burton. Rearrangements of functions, saddle points and uncountable families of steady configurations for a vortex. 1987. Vol. 163. In Acta Mathematica. pp.291-309. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203313459920438.