1. School of Mathematics Northwest University Xi'an China
2. Department of Mathematics Khawaja Fareed University of Engineering and Information Technology Rahim Yar Khan Pakistan
3. Department of Mathematics University of Management and Technology Lahore Pakistan
4. Mathematical Sciences College of Science and Technology Wenzhou‐Kean University Wenzhou China
5. Department of Mathematics Near East University TRNC Mersin 10 Nicosia Turkey
6. School of Aerospace and Mechanical Engineering Nanyang Technological University Singapore
7. Department of Mathematics and Statistics St. Francis Xavier University Antigonish Nova Scotia Canada