作者机构:[1]College of Mathematics, Jilin University, Changchun, 130012, [2]College of Mathematics, Jilin Normal University, Siping, Jilin, 136000
相关基金:The NSF (11271155,11001105,11071126,10926156 and 11071269) of China; the Specialized Research Fund (20110061110003 and 20090061120037) for the Doctoral Program of Higher Education; the General Humanities and Social Science Research Projects (11YJAZH125) Sponsored by Ministry of Education; the Science and Technology Development Program (201201082) of Jilin Province