[1] UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60607
[2] TATA INST FUNDAMENTAL RES,BOMBAY 400005,MAHARASHTRA,INDIA
[3] UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY
[4] TOHOKU UNIV,DEPT PHYS,SENDAI,MIYAGI 980,JAPAN
[5] NATL RES INST MET,TSUKUBA,IBARAKI 305,JAPAN