1. Faculty of Computing, Universiti Teknologi Malaysia, Johor Bahru 81310, Malaysia
2. Department of Mathematics, Bauchi State University Gadau, PMB 068 Bauchi State, Nigeria
3. Department of Computer and Information Sciences, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
4. School of Computer and Systems Sciences, Jawaharlal Nehru University, New Delhi 110067, India
5. Department of Computer Science, Indira Gandhi National Tribal University, Amarkatnak 484886, India