作者机构:[1]Department of Mathematics and Statistics, University of Houston-Clear Lake, Houston TX 77058, USA, [2]Department of Mathematics, School of Mathematical Sciences, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
相关基金:Supported by the National Natural Science Foundation of China(Grant No.11271275); the Natural Science Foundation of Shanghai Municipal(Grant No.13ZR1422500)