1. School of Mathematics Qilu Normal University Jinan China
2. Department of Mathematics University of Peshawar Peshawar Khyber Pakhtunkhwa Pakistan
3. Department of Exact Science and Engineering “1 Decembrie 1918” University of Alba Iulia Alba Iulia Romania
4. Faculty of Mathematics and Computer Science Transilvania University of Brasov Brasov Romania
5. School of Mathematical Sciences Chongqing Normal University Chongqing China
6. Faculty of Science and Arts Mohail Asser, King Khalid University Abha Saudi Arabia