[1] UNIV DORTMUND,INST EXPTL PHYS Y,D-4600 DORTMUND,FED REP GER
[2] UNIV GLASGOW,DEPT NAT PHILOSOPHY,GLASGOW G12 8QQ,SCOTLAND
[3] UNIV LONDON IMPERIAL COLL SCI & TECHNOL,LONDON SW7 2AZ,ENGLAND
[4] MAX PLANCK INST PHYS,D-8000 MUNCHEN 40,FED REP GER
[5] IST NAZL FIS NUCL,DEPARTIMENTO FIS,PISA,ITALY
[6] SCUOLA NORMALE SUPER,I-56100 PISA,ITALY
[7] IST NAZL FIS NUCL,IST FIS,TRIESTE,ITALY
[8] UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706