作者机构:[1]Nonlinear Science Center and Department of Mathematics, Ningbo University, Ningbo 315211, China, [2]MM Key Lab, Chinese Academy of Sciences, Beijing 100080, China
相关基金:Project supported by the National Natural Science Foundation of China (Grant No. 10735030), National Basic Research Program of China (Grant No. 2007CB814800), Ningbo Natural Science Foundation (Grant No. 2008A610017) and K.C. Wong Magna Fund in Ningbo University.