[1] UNIV ROME LA SAPIENZA,DEPARTIMENTO FIS,I-00185 ROME,ITALY
[2] IST NAZL FIS NUCL,ROMA,ITALY
[3] UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,ROME,ITALY
[4] IST NAZL FIS NUCL,PISA,ITALY
[5] UNIV PISA,DEPARTIMENTO FIS,I-56100 PISA,ITALY
[6] CERN,CH-1211 GENEVA 23,SWITZERLAND
[7] UNIV PADUA,I-35100 PADUA,ITALY
[8] IST NAZL FIS NUCL,PADUA,ITALY
[9] UNIV BOLOGNA,DEPARTIMENTO FIS,I-40126 BOLOGNA,ITALY
[10] ROCKEFELLER UNIV,NEW YORK,NY 10021