@inproceedings{shu-cheng2011li-yau,
title={LI-YAU GRADIENT ESTIMATE AND ENTROPY FORMULAE FOR THE CR HEAT EQUATION IN A CLOSED PSEUDOHERMITIAN 3-MANIFOLD},
author={Shu-Cheng Chang, Ting-Jung Kuo, and Sin-Hua Lai},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160913210333812603899},
booktitle={Journal of Differential Geometry},
volume={89},
number={2},
pages={185-216},
year={2011},
}

Shu-Cheng Chang, Ting-Jung Kuo, and Sin-Hua Lai. LI-YAU GRADIENT ESTIMATE AND ENTROPY FORMULAE FOR THE CR HEAT EQUATION IN A CLOSED PSEUDOHERMITIAN 3-MANIFOLD. 2011. Vol. 89. In Journal of Differential Geometry. pp.185-216. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160913210333812603899.