1. University of Bejaia,LMED Laboratory, Faculty of Exact Sciences,Bejaia,Algeria,06000
2. University of Bejaia,Faculty of Exact Sciences,Bejaia,Algeria,06000
3. Khmelnytskyi National University,Department of Computer Engineering & Information Systems,Khmelnytskyi,Ukraine
4. Lviv Polytechnic National University,Information Systems and Networks Department,Lviv,Ukraine