@inproceedings{michael1985the,
title={The existence of surfaces of constant mean curvature with free boundaries},
author={Michael Struwe},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203309564182410},
booktitle={Acta Mathematica},
volume={160},
number={1},
pages={19-64},
year={1985},
}
Michael Struwe. The existence of surfaces of constant mean curvature with free boundaries. 1985. Vol. 160. In Acta Mathematica. pp.19-64. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203309564182410.