1. Department of Mathematics, University of Sargodha , 40100 Sargodha , Pakistan
2. School of Mathematical Sciences, Universiti Sains Malaysia , 11800 Penang , Malaysia
3. Department of Mathematics, Faculty of Sciences, University of Nouakchott Al Aasriya , Nouakchott Bp 6093 , Mauritania
4. Department of Mathematics, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences, Saveetha University , Chennai-602 105 , Tamil Nadu , India
5. MEU Research Unit, Middle East University , Amman , Jordan
6. Department of Physics, College of Science, Northern Border University , Arar , Saudi Arabia