作者机构:[1]Department of Mathematics, Zhejiang Normal University, Jinhua 321004, China, [2]School of Mathematical Sciences, South China University of Technology, Guangzhou 510641, China
相关基金:Supported by the Zhejiang Provincial Natural Science Foundation of China(102055); Supported by the NSF of China(10471131); Supported by tile Foundation of Zhejiang Universities' Youth Teachers