1. Department of Mathematics, Cotton University, Panbazar, Guwahati, Assam, India
2. Department of Mathematics, Gauhati University, Guwahati, Assam, India
3. Department of Mathematics, Gilan-E-Gharb Branch, Islamic Azad University, Gilan-E-Gharb, Iran
4. Discipline of Natural Science, Indian Institute of Information Technology, Design, and Manufacturing Jabalpur, India