1. Department of Mathematics, Northeast Forestry University, Harbin 150040, China
2. Department of Mathematics and Humanities, Maharishi Markandeshwar (Deemed to Be University), Mullana, Ambala 133207, Haryana, India
3. Division of Mathematics, School of Basic Sciences, Galgotias University, Greater Noida 203201, Uttar Pradesh, India
4. Department of Management Information Systems, Adana Alparslan Turkes Science and Technology University, 01250 Adana, Turkey
5. School of Mathematics, Hangzhou Normal University, Hangzhou 311121, China