Institution: | (1) Institute of Mathematic and Computer Science, Wroclaw University of Technology, Wyb. Wyspianskiego 27, PL-50-370 Wroclaw, Poland;(2) Faculty of Science, Ningbo University, Ningbo, 315211, Zhejiang Province, Peoples republic of China;(3) School of Information Science and Technology, East China University of Political Science and Law, Shanghai, 200042, P. R. China |