1. Department of Mathematics, Zhejiang University of Science and Technology, Hangzhou, China
2. Department of Mathematics, Shaoxing University, Shaoxing, China
3. College of Mathematic and Information Science, Shandong Technology and Business University, Yantai,
Shandong, China
4. Yantai Key Laboratory of Big Data Modeling and Intelligent Computing, Yantai, Shandong, China