@inproceedings{henrik1999a,
title={A note on rigidity of 3-Sasakian manifolds},
author={Henrik Pedersen, and Yat Sun Poon},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020221031862711344},
booktitle={Proceedings of the American Mathematical Society},
volume={127},
number={10},
pages={3027-3034},
year={1999},
}
Henrik Pedersen, and Yat Sun Poon. A note on rigidity of 3-Sasakian manifolds. 1999. Vol. 127. In Proceedings of the American Mathematical Society. pp.3027-3034. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191020221031862711344.