“…We can only give a few examples by mentioning applications to the fields of potential theory, potential flow, and Stokes flow [47,145,278,279,299,302], the biharmonic equation [147], the Helmholtz equation [24], the modified Helmholtz equation [187], elastostatics [76,148,150,196,233], Signorini problems [226], fracture mechanics [124,149], the wave equation and acoustics [12,122,162], heat conduction [43,140,141,143], diffusion 1 [46,133,296,297,300], Stefan problems [44,142], Brinkman flows [275], oscillatory and porous buoyant flow [277], diffusion-reaction equations [22], calculation of eigenfrequencies and eigenmodes [9], radiation and scattering problems [75], acoustic wave scattering on poroelastic scatterers [211], microstrip antenna analysis [252], or to two-dimensional unsteady Burger's equations 2 [298].…”