1. Faculty of Sciences, Department of Mathematics and Informatics, University of Novi Sad, Novi Sad, Serbia.
2. Faculty of Technical Sciences, Department of Fundamental Sciences, University of Novi Sad, Novi Sad, Serbia.
3. Faculty of Technical Sciences, Department of Power, Electronic and Communication Engineering, University of Novi Sad.
4. Amazon Alexa AI, Seattle, WA 98109 USA.
5. Department of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, PA 15213-3890 USA.