1. Department of Science, Henan University of Animal Husbandry and Economy, Zhengzhou 450046, China
2. School of Mathematics and Physics, Hulunbuir University, Hulunbuir 021008, China
3. School of Mathematics and Informatics, Henan Polytechnic University, Jiaozuo 454010, China
4. Independent Researcher, University Village, Dallas, TX 75252, USA