1. Department of Mathematics, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
2. Department of Mathematics, Government College University, Faisalabad 38000, Pakistan
3. Department of Mathematics, Faculty of Science and Arts, Düzce University, Duzce 81620, Turkey
4. Department Scientific-Methodical Sessions, Romanian Mathematical Society-Branch Bucharest, Academy Street no. 14, RO-010014 Bucharest, Romania
5. Department of Mathematics, COMSATS University Islamabad, Islamabad 4000, Pakistan