1. Department of Mathematics University of Azad Jammu and Kashmir Muzaffarabad Pakistan
2. Department of Mathematics, Faculty of Sciences and Arts in Zahran Alganoob King Khalid University Abha Saudi Arabia
3. Department of Mathematics, Faculty of Sciences and Arts (Mahayel) King Khalid University Abha Saudi Arabia
4. Department of Mathematics, Faculty of Science Mansoura University Mansoura Egypt