1. Department of Mathematics, Dhaka University, Dhaka, Bangladesh
2. Mathematics Discipline, Khulna University, Khulna, Bangladesh
3. Gort Engovation (Propulsion/Biomechanics) Research, Bradford, UK
4. Deptartment of Mathematics, Chittagong University, Chittagong, Bangladesh
5. Mathematics Discipline, Khulna University, Khulna-9208, Bangladesh