Angewandte MathematikWolfgang Hackbusch × Numerical Techniques for Boundary Element MethodsProceedings of the Seventh GAMM-Seminar Kiel, January 25–27, 1991Wolfgang HackbuschVieweg & TeubnerSoftcover1992 Efficient Solutions of Elliptic SystemsProceedings of a GAMM-Seminar Kiel, January 27 to 29, 1984Wolfgang HackbuschVieweg & TeubnerSoftcover1984