For operators comparable to the fractional Laplacian of order 2s, solutions with zero exterior data on Reifenberg flat domains are C^{s-ε} up to the boundary.
Higher order elliptic and parabolic systems with variably p artially BMO coefficients in regular and irregular domains
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Boundary regularity for nonlocal elliptic equations over Reifenberg flat domains
For operators comparable to the fractional Laplacian of order 2s, solutions with zero exterior data on Reifenberg flat domains are C^{s-ε} up to the boundary.