[1] Malmo Univ, Grp Mat Sci & Appl Math, S-20506 Malmo, Sweden
[2] Hebei Univ, Coll Phys Sci & Technol, Hebei Key Lab Opt Elect Informat & Mat, Baoding 071002, Peoples R China
[3] Lund Univ, Dept Phys, Div Math Phys, S-22100 Lund, Sweden
[4] Fudan Univ, Dept Nucl Sci & Technol, Shanghai EBIT Lab Inst Modern Phys, Shanghai 200433, Peoples R China
[5] Univ British Columbia, Dept Comp Sci, Vancouver, BC V6T 1Z4, Canada
[6] Vilnius Univ, Inst Theoret Phys & Astron, LT-10222 Vilnius, Lithuania
[7] Univ Libre Bruxelles, Chim Quant & Photophys, B-1050 Brussels, Belgium