作者机构:[1]School of Mathematical Sciences, Jiangsu Key Laboratory for NSLSCS, Nanjing Normal University, Nanjing 210023, China, [2]Department of Social Science Teaching, Nanjing Institute of Railway Technology, Nanjing 210031, China, [3]PPGEPS, Pontifical Catholic University of Parana (PUCPR), Curitiba, Parana, Brazil
相关基金:Acknowledgements This work was supported by the National Natural Science Foundation of China (Grant No. 11171159),the Specialized Research Fund of Doctoral Program of Higher Education of China (Grant No. 20103207110002), the Fund for Innovative Program of Jiangsu Province (Grant No. CXLX12_0387), CNPq-Brazil (Grant No. 301748/ 2011-0), and the Research Fund of Pontifical Catholic University of Parana, Brazil.