@inproceedings{h1974scalar,
title={Scalar curvature, non-abelian group actions, and the degree of symmetry of exotic spheres},
author={H Blaine Lawson, and Shing-Tung Yau},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224203733209529078},
booktitle={Commentarii Mathematici Helvetici},
volume={49},
number={1},
pages={232-244},
year={1974},
}

H Blaine Lawson, and Shing-Tung Yau. Scalar curvature, non-abelian group actions, and the degree of symmetry of exotic spheres. 1974. Vol. 49. In Commentarii Mathematici Helvetici. pp.232-244. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224203733209529078.