TY - JOUR AU - Ludwig Wagatha TI - Approximation of Pseudodifferential Operators in Absorbing Boundary Conditions for Hyperbolic Equations. JO - Numerische Mathematik PY - 1983 SP - 51 EP - 64 VL - 42 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/NUMA_1983__42_132860/ ID - NUMA_1983__42_132860 ER -