1. Department of Algorithms and System Modeling, Faculty of Electronics, Telecommunications and Informatics; Gdańsk University of Technology, 80-233; Gdańsk; Poland
2. Fakultät für Mathematik; TU Chemnitz, D-09107; Chemnitz; Germany
3. Institut für Mathematik; TU Ilmenau, D-98684; Ilmenau; Germany
4. Institut für Optimierung und Operations Research Universität; ULM, D-89069; ULM; Germany