1. Business School, Nanjing Normal University, Nanjing, P. R. China
2. Faculty of Civil Engineering, Slovak University of Technology, Radlinského 11, Sk-810 05 Bratislava, Slovakia
3. Palacky Univ Olomouc, Fac Sci, Dept Algebra & Geometry, 17 Listopadu 12, Olomouc 77146, Czech Republic
4. Machine Intelligence Institute, Iona College, New Rochelle, NY 10801, USA