@inproceedings{ermanno1999on,
title={On the Poincaré inequality for vector fields},
author={Ermanno Lanconelli, and Daniele Morbidelli},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203559817131754},
booktitle={Arkiv for Matematik},
volume={38},
number={2},
pages={327-342},
year={1999},
}
Ermanno Lanconelli, and Daniele Morbidelli. On the Poincaré inequality for vector fields. 1999. Vol. 38. In Arkiv for Matematik. pp.327-342. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203559817131754.