1. Department of Mathematics, Bacha Khan University, Charsadda, Khyber Pakhtunkhwa, Pakistan
2. Department of Mathematics, University of Malakand, Chakdara Dir(Lower), Khyber Pakhtunkhwa, Pakistan
3. Department of Mathematics, Abdul Wali Khan University, Mardan, Khyber Pakhtunkhwa, Pakistan
4. Department of Mathematical Sciences, Universiti Teknologi, Johor Bahru, Malaysia