[1] UNIV MILAN,COMO,ITALY
[2] UNIV MILAN,IST NAZL FIS MAT,I-22100 MILAN,ITALY
[3] INST NAZL FIS NUCL,SEZIONE PAVIA,PAVIA,ITALY
[4] INST NAZL FIS NUCL,SEZIONE MILANO,MILAN,ITALY
[5] HONG KONG BAPTIST UNIV,DEPT PHYS,HONG KONG,HONG KONG
[6] HONG KONG BAPTIST UNIV,CTR NONLINEAT & COMPLEX SYST,HONG KONG,HONG KONG
[7] UNIV MARIBOR,CTR APPL MATH & THEORET PHYS,SLO-2000 MARIBOR,SLOVENIA