1. Department of Mathematics, Faculty of Science, University of Gujrat, Sub-Campus, Mandi Bahauddin, Pakistan
2. Laboratory of Mechanics, Faculty of Sciences Aïn Chock, Hassan II University of Casablanca, Casablanca, Morocco
3. Department of Statistics, Faculty of Science, Bahauddin Zakariya University, Multan, Pakistan
4. Department of Mathematics, College of Sciences, King Khalid University, Abha, Saudi Arabia