1. Department of Computer Science, City University of Science and Information Technology, Peshawar 25000, Pakistan
2. Faculty of Informatics, Kaunas University of Technology, 51368 Kaunas, Lithuania
3. Department of Applied Informatics, Vytautas Magnus University, 44404 Kaunas, Lithuania
4. Faculty of Applied Mathematics, Silesian University of Technology, 44-100 Gliwice, Poland
5. Department of Computer & Software Technology, University of Swat, Swat 19200, Pakistan