Affiliation: | (1) Department of Mathemtics, Anhui Normal University, Wuhu, 241000, P. R. China;(2) Division of Computational Science, E-Institutes of Shanghai Univ. at SJTU, Shanghai, 200240, P. R. China;(3) Department of Mathematics, Huzhou Teachers College, Huzhou, 313000, P. R. China |