[1] UNIV BARI,I-70126 BARI,ITALY
[2] IST NAZL FIS NUCL,BARI,ITALY
[3] CERN,CH-1211 GENEVA 23,SWITZERLAND
[4] UNIV LONDON BIRKBECK COLL,LONDON WC1E 7HX,ENGLAND
[5] UNIV LONDON UNIV COLL,LONDON WC1E 6BT,ENGLAND
[6] UNIV ROME,I-00185 ROME,ITALY
[7] UNIV TURIN,I-10125 TURIN,ITALY
[8] NATL INST NUCL PHYS,ROME,ITALY
[9] IST NAZL FIS NUCL,TURIN,ITALY