1. Complex Systems Research Center, Shanxi University, Taiyuan, Shanxi 030006, China
2. Department of Mathematics and Physics, Anyang Institute of Technology, Anyang 455000, China
3. Department of Mathematics and Statistics, University of Victoria, Victoria, BC, Canada V8W 3R4
4. Department of Mathematics, Southeast University, Nanjing 210096, China
5. Ecological Complexity and Modeling Laboratory, University of California, Riverside, CA 92521-0124, USA
6. Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka 816-8580, Japan
7. College of Physics Science and Technology, Yangzhou University, Yangzhou, Jiangsu 225002, China
8. Department of Botany and Plant Sciences, University of California, Riverside, CA 92521-0124, USA