Banjai, L; Börm, S; Sauter, S (2008). FEM for elliptic eigenvalue problems: how coarse can the coarsest mesh be chosen? An experimental study. Computing and Visualization in Science, 11(4-6):363-372.
Börm, S; Sauter, S (2005). BEM with linear complexity for the classical boundary integral operators. Mathematics of Computation, 74(251):1139-1177 (electronic).
Börm, S; Krzebek, N; Sauter, S (2005). May the singular integrals in BEM be replaced by zero? Computer Methods in Applied Mechanics and Engineering, 194(2-5):383-393.