1. Faculty of Informatics and Computing, Singidunum University, 11000 Belgrade, Serbia
2. Department of Mathematics, Saveetha School of Engineering, SIMATS Thandalam, Chennai 602105, India
3. Department of Informatics and Computing, University Sinergija, 76300 Bijeljina, Bosnia and Herzegovina
4. MEU Research Unit, Middle East University, Amman 11813, Jordan
5. Department of Computer Science, Faculty of Sciences, University of Craiova, A.I. Cuza, 13, 200585 Craiova, Romania