Operators and Matrices · Volume 9, Issue 1 A transmission problem for the Helmholtz equation with higher order boundary conditions 09-12 Pages 203-223 DOI 10.7153/oam-09-12 Downloads Short PDF Full PDF PNG Authors A. M. Simões Keywords boundary value problem Helmholtz equation Bessel potential space convolution type operator Fredholm operator higher order boundary condition Wiener-Hopf operator not normally solvable operators image normalization Subject classes 35J05 35J25 47B35 35S05 47A53 45E10 47F05 35R25