@inproceedings{conan2008hard,
title={Hard Lefschetz actions in Riemannian geometry with special holonomy},
author={Conan Leung, and Changzheng Li},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160831102906265203564},
booktitle={MRL},
volume={15},
pages={683-698},
year={2008},
}
Conan Leung, and Changzheng Li. Hard Lefschetz actions in Riemannian geometry with special holonomy. 2008. Vol. 15. In MRL. pp.683-698. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160831102906265203564.