作者机构:[1]School of Science Courses, Shenyang Institute of Aeronautical Engineering, Shenyang 110136, P. R. China, [2]CORA, Department of Applied Mathematics, Dalian University of Technology, Dalian 116024, P. R. China
相关基金:Project supported by the National Natural Science Foundation of China (Nos. 10372063, 10771026 and 10471015)
Acknowledgements The au'thors are greatly indebted to the anonymous referees for their valuable comments and suggestions.