1. College of Science, Qiongtai Normal University, Haikou, Hainan 571127, China
2. Department of Mathematics, Government College University, Lahore 54000, Pakistan
3. Department of Software, Sejong University, Seoul, Republic of Korea
4. Department of Mathematics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
5. Department of Mathematics, University of Okara, Okara, Pakistan