1. Department of Mathematics, Faculty of Science, Humanities and Education, Technical University of Liberec, Studentská 2, 461 17 Liberec, Czech Republic
2. Composite Materials and Technical Mechanics, Institute of Aeronautical Engineering, Faculty of Mechanical Engineering, Universität der Bundeswehr München, Werner-Heisenberg-Weg 39, 85579 Neubiberg, Munich, Germany