Affiliation: | a Institut für Angewandte Mathematik, Universität Bonn, Wegelerstr. 6, D-53115 Bonn, Germany b SFB 611, Bonn, Germany c BiBoS, Bielefeld-Bonn, Germany d IZKS, Bonn, Germany e CERFIM, Locarno, Switzerland f Acc. Arch. USI, Switzerland g International Center for Mathematical Modeling in Physics and Cognitive Sciences MSI, Växjö University, Sweden h St.-Petersburg State Architecture and Civil Engineering University, Russia |