Grigoryan, Alexander, Hu, Eryan, and Hu, Jiaxin. 2018. “Two-sided estimates of heat kernels of jump type Dirichlet forms”. ADVANCES IN MATHEMATICS 330: 433-515.
Grigoryan, Alexander, Hu, Eryan, and Hu, Jiaxin. 2017. “Lower estimates of heat kernels for non-local Dirichlet forms on metric measure spaces”. JOURNAL OF FUNCTIONAL ANALYSIS 272 (8): 3311-3346.