1. Institute of Mathematics, Khwaja Fareed University of Engineering & Information Technology, Rahim Yar Khan 64200, Pakistan
2. Department of Mathematics, Central South University, Changsha, China
3. Department of Mathematics, Deanship of Applied Sciences, Umm Al-Qura University, Makkah, Saudi Arabia
4. Department of Mathematics, Abdul Wali Khan University, Mardan 23200, Pakistan
5. Department of Mathematics and Computer Science, University of Kinshasa, Kinshasa, Congo