MathSciNet bibliographic data MR2981852 60J35 (60J75) Chen, Zhen-Qing; Kim, Panki; Song, Renming Dirichlet heat kernel estimates for $\Delta^{\alpha/2}+\Delta^{\beta/2}$$\Delta^{\alpha/2}+\Delta^{\beta/2}$. Illinois J. Math. 54 (2010), no. 4, 1357–1392 (2012). Article

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