1. Department of Mathematics & Physics, Khulna Agricultural University, Khulna, Bangladesh
2. Division of Mathematical and Physical Sciences, Kanazawa University, Kanazawa, Japan
3. Department of Mathematics, Khulna University of Engineering & Technology, Khulna, Bangladesh
4. Mathematics Department, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
5. Department of Mathematics, Faculty of Sciences, Cairo University, Giza, Egypt