作者机构:[1]Department of Mathematics, Shanghai Jiaotong University, Shanghai 200240, China, [2]SB and SEF, The University of Hong Kong, Pokfulam Road, Hong Kong, China, [3]Department of Mathematics, University of Science and Technology of China, Hefei 230026, China
相关基金:Project supported by the National Natural Science Foundation of China (Grant No 10401022).