作者机构:[1]College of Science, University of Shanghai for Science and Technology Shanghai 200093, P. R. China, [2]Academy of Mathematics and System Sciences Chinese Academy of Sciences, Beijing 100080, P. R. China
相关基金:Research is supported by the National Natural Science Foundation of China (11271260), Shanghai Leading Academic Discipline Project (No. XTKX2012), the Hujiang Foundation of China (B14005) and the Innovation Program of Shanghai Municipal Education Committee (13ZZ116).