J. Bae, J. Kang, P. Kim and J. Lee, Heat kernel estimates for symmetric jump processes with mixed polynomial growths, The Annals of Probability, 47(5) (2019), 2830–2868.
J. Kang and P. Kim, Tangential limits for harmonic functions with respect to $\phi(\Delta)$ : stable and beyond, Potential Analysis, 42(3) (2015), 629–644.
J. Kang and P. Kim, On estimates of Poisson kernels for symmetric Lévy processes, Journal of the Korean Mathematical Society, 50(5) (2013), 1009–1031.