@article{NUMA_1993__66_3_133759,
     author = {Ian H. Sloan and Rainer Kress},
     title = {On the numerical solution of a logarithmic integral equation of the first kind for the {Helmholtz} equation.},
     journal = {Numerische Mathematik},
     pages = {199--214},
     publisher = {mathdoc},
     volume = {66},
     number = {3},
     year = {1993},
     zbl = {0791.65089},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1993__66_3_133759/}
}