TY - JOUR AU - Kleefeld, Andreas AU - Lin, Tzu-Chu TI - Boundary element collocation method for solving the exterior Neumann problem for Helmholtz's equation in three dimensions JO - Electronic transactions on numerical analysis PY - 2012 SP - 113 EP - 143 VL - 39 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/ETNA_2012__39__a18/ LA - en ID - ETNA_2012__39__a18 ER -