1. Department of Mathematics, Shri Vaishnav Institute of Science, Shri Vaishnav Vidyapeeth Vishwavidyalaya, Gram Baroli Sanwer Road, Indore 453111, India
2. Department of Mathematical Sciences and Computing, Walter Sisulu University, Mthatha 5117, South Africa
3. Institute of Informatics, Faculty of Business and Management, Brno University of Technology, Kolejni 2906/4, 612 00 Brno, Czech Republic