MathSciNet bibliographic data MR2912450 31B25 Chen, Zhen-Qing; Kim, Panki; Song, Renming; Vondraček, Zoran Boundary Harnack principle for $\Delta+\Delta\sp {\alpha/2}$$\Delta+\Delta\sp {\alpha/2}$. Trans. Amer. Math. Soc. 364 (2012), no. 8, 4169–4205. Article

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