1. Research Team on Intelligent Decision Support Systems, Department of Artificial Intelligence and Applied Mathematics, Faculty of Computer Science and Information Technology, West Pomeranian University of Technology in Szczecin, ul. Żołnierska 49, 71-210 Szczecin, Poland
2. Faculty of Information Technology and Computer Science, West Pomeranian University of Technology, ul. Zolnierska 49, 71-210 Szczecin, Poland
3. Institute of Management, University of Szczecin, Cukrowa 8, 71-004 Szczecin, Poland
4. National Institute of Telecommunications, Szachowa 1, 04-894 Warsaw, Poland