Institution: | 1. Chair of Solid Mechanics , University of Siegen , Paul-Bonatz-Stra?e 9-11, Siegen 57068, Germany anders@imr.mb.uni-siegen.de;3. Chair of Probability Theory and Analysis , University of Siegen , Walter-Flex-Stra?e 3, Siegen, 57068, Germany;4. Chair of Solid Mechanics , University of Siegen , Paul-Bonatz-Stra?e 9-11, Siegen 57068, Germany |