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Lieberman, G.M. (1985) The Perron Process Applied to Oblique Derivative Problems. Advances in Mathematics, 55, 161-172.
https://doi.org/10.1016/0001-8708(85)90019-2

has been cited by the following article:

• TITLE: The Regularity of Solutions to Mixed Boundary Value Problems of Second-Order Elliptic Equations with Small Angles

  AUTHORS: Mingyu Wu

  KEYWORDS: Mixed Boundary Value Problems for Elliptic Equations, Small-Angle Boundary Value Problems, Regularity of Solutions to Elliptic Equations

  JOURNAL NAME: Journal of Applied Mathematics and Physics, Vol.12 No.4, April 11, 2024

  ABSTRACT: This paper considers the regularity of solutions to mixed boundary value problems in small-angle regions for elliptic equations. By constructing a specific barrier function, we proved that under the assumption of sufficient regularity of boundary conditions and coefficients, as long as the angle is sufficiently small, the regularity of the solution to the mixed boundary value problem of the second-order elliptic equation can reach any order.