1. Department of Mathematical Sciences, Bodoland University, Kokrajhar 783370, Assam, India
2. Department of Mathematics, Dibrugarh University, Dibrugarh 786004, Assam, India
3. Department of Humanities and Basic Sciences, Manipur Institute of Technology, A Constitute College of Manipur University, Takyepat 795004, Manipur, India
4. Department of Mathematics and Applied Mathematics, Sefako Makgatho Health Sciences University, Gauteng 0208, South Africa
5. Department of Architecture, Federico II Naples University, Via Toledo 402, 80134 Naples, Italy