1. School of Computer Science, Chengdu University, Chengdu 610106, China
2. Key Laboratory of Pattern Recognition and Intelligent Information Processing of Sichuan, Chengdu University, Chengdu 610106, China
3. Department of Mathematics, The University of Faisalabad, Sargodha Road, University Town Faisalabad, Faisalabad 38000, Pakistan
4. Department of Mathematics and Statistics, Jordan University of Science and Technology, P.O. Box 3030, Irbid 22110, Jordan
5. Department of Mathematics, University of Wah, Wah Cantt 47040, Pakistan
6. Department of Mathematics, COMSATS University Islamabad, Sahiwal 57000, Pakistan