@inproceedings{berndt，jürgen2010hyperpolar,
title={HYPERPOLAR HOMOGENEOUS FOLIATIONS ON SYMMETRIC SPACES OF NONCOMPACT TYPE},
author={Berndt，Jürgen, Díaz-Ramos, and Hiroshi Tamaru},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160911224849325819854},
booktitle={Journal of Differential Geometry},
volume={86},
number={2},
pages={191-235},
year={2010},
}

Berndt，Jürgen, Díaz-Ramos, and Hiroshi Tamaru. HYPERPOLAR HOMOGENEOUS FOLIATIONS ON SYMMETRIC SPACES OF NONCOMPACT TYPE. 2010. Vol. 86. In Journal of Differential Geometry. pp.191-235. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160911224849325819854.