@inproceedings{gregor2006classification,
title={Classification of Levi degenerate homogeneous CR-manifolds in dimension 5},
author={Gregor Fels, and Wilhelm Kaup},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203352203902705},
booktitle={Acta Mathematica},
volume={201},
number={1},
pages={1-82},
year={2006},
}
Gregor Fels, and Wilhelm Kaup. Classification of Levi degenerate homogeneous CR-manifolds in dimension 5. 2006. Vol. 201. In Acta Mathematica. pp.1-82. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203352203902705.