@inproceedings{jeff2009compression,
title={Compression bounds for Lipschitz maps from the Heisenberg group to$L$_{1}},
author={Jeff Cheeger, Bruce Kleiner, and Assaf Naor},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203357540742747},
booktitle={Acta Mathematica},
volume={207},
number={2},
pages={291-373},
year={2009},
}
Jeff Cheeger, Bruce Kleiner, and Assaf Naor. Compression bounds for Lipschitz maps from the Heisenberg group to$L$_{1}. 2009. Vol. 207. In Acta Mathematica. pp.291-373. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203357540742747.