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Lasiecka, Irena; Stahel, Andreas (1990). The wave equation with semilinear Neumann boundary conditions Nonlinear Analysis, Theory, Methods and Applications, 15(1), pp. 39-58. Elsevier
Stahel, Andreas (1989). Hyperbolic Initial Boundary Value Problems with Nonlinear Boundary Conditions Nonlinear Analysis, Theory, Methods and Applications, 13(3), pp. 231-257. Elsevier 10.1016/0362-546X(89)90052-7
