Institution: | a Institut für Angewandte Mathematik, Universität Bonn, Wegelerstr. 6, D-53115, Bonn, Germany b IZKS and SFB 611, Bonn, Germany c BiBoS, Bielefeld, Germany d CERFIM, Locarno, Switzerland e Accademia di Architettura, Mendrisio, Switzerland f Institute for Applied Problems of Mechanics and Mathematics, 3b Naukova st., 79601 Lviv, Ukraine g Lviv National University, 1 Universytetska st., 79602 Lviv, Ukraine |