作者机构:[1]College of Mathematics and Information Science, Henan Normal University, Xinxiang 453007, China, [2]Department of Mathematics, Taizhou University, Taizhou 225300, China, [3]School of Mathematical Sciences, Yancheng Teachers University, Yancheng 224002, China
相关基金:Acknowledgements This work was supported by the National Natural Science Foundation of China (Grant Nos. 11371121, 11371308, 11201114, 11301457).