作者机构:[1]School of Mathematical Sciences, Dalian University of Technology, Liaoning 116024, P. R. China
相关基金:Supported by the National Natural Sciences Foundation of China (Grant No. 61175041), the Funds of Doctoral Programme of China (Grant No. 2010041110036), the Fundamental Research Funds for the Central Universities (Grant Nos. DUT12LK16; DUT12LK29) and the Funds for Frontier Interdisciplines of DUT (Grant Nos. DUT12JS05; DUT10JS06).