1. Department of Mathematics University of Peshawar Peshawar Pakistan
2. Department of Computing, Mathematics and Electronics “1 Decembrie 1918” University of Alba Iulia Alba Iulia Romania
3. Faculty of Mathematics and Computer Science Transilvania University of Brasov Brasov Romania
4. Department of Chemistry, College of Science and Art Muhayil Asser King Khalid University Abha Saudi Arabia
5. Department of Mathematics, College of Science and Art Muhayil Asser King Khalid University Abha Saudi Arabia