Bogdan, Krzysztof. “The Boundary Harnack Principle for the Fractional Laplacian”. Studia Mathematica, vol. 123, no. 1, 1997, pp. 43-80, https://doi.org/10.4064/sm-123-1-43-80.
Bogdan, K. (1997). The boundary Harnack principle for the fractional Laplacian. Studia Mathematica, 123(1), 43-80. https://doi.org/10.4064/sm-123-1-43-80
Bogdan, Krzysztof. “The Boundary Harnack Principle for the Fractional Laplacian”. Studia Mathematica 123, no. 1 (1997): 43-80. https://doi.org/10.4064/sm-123-1-43-80.
Bogdan K. The boundary Harnack principle for the fractional Laplacian. Studia Mathematica. 1997;123(1):43-80.