@inproceedings{karsten2008positively,
title={POSITIVELY CURVED COHOMOGENEITY ONE MANIFOLDS AND 3-SASAKIAN GEOMETRY},
author={Karsten Grove, Burkhard Wilking, and Wolfgang Ziller},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160909103931009980705},
booktitle={Journal of Differential Geometry},
volume={78},
number={1},
pages={33-111},
year={2008},
}
Karsten Grove, Burkhard Wilking, and Wolfgang Ziller. POSITIVELY CURVED COHOMOGENEITY ONE MANIFOLDS AND 3-SASAKIAN GEOMETRY. 2008. Vol. 78. In Journal of Differential Geometry. pp.33-111. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160909103931009980705.