1. Department of Knowledge-Based Mathematical Systems, Johannes Kepler University, Linz, Austria
2. Department of Statistics, Faculty of Mathematics and Computer Science, Shahid Bahonar University of Kerman, Kerman, Iran
3. Department of Mathematics, Indian Institute of Technology Patna, Patna, India
4. Department of Mathematics and Descriptive Geometry, Faculty of Civil Engineering, Slovak University of Technology, Bratislava, Slovakia
5. Institute of Information Theory and Automation, Czech Academy of Sciences, Prague, Czech Republic