作者机构:[1]Department of Mathematics, Hefei University of Technology Hefei 230009, China, [2]Wu Wen-Tsun Key Laboratory of MathematicsUniversity of Science and Technology of China, Hefei 230026, China, [3]Department of Mathematics, Tongji University, Shanghai 200092, China
相关基金:Supported by the NNSF (11271284, 11301130, 11371278 and 11431010) of China and the Fundamental Research Funds for the Central Universities.