@inproceedings{alexander2017lower,
  title={Lower estimates of heat kernels for non-local Dirichlet forms on metric measure spaces},
  author={Alexander Grigor'yan, Eryan Hu, and Jiaxin Hu},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20161201132828424261670},
  booktitle={Journal of Functional Analysis},
  volume={272},
  number={8},
  pages={3311–3346},
  year={2017},
}
             
            
                
Alexander Grigor'yan, Eryan Hu, and Jiaxin Hu. Lower estimates of heat kernels for non-local Dirichlet forms on metric measure spaces. 2017. Vol. 272. In Journal of Functional Analysis. pp.3311–3346. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20161201132828424261670.