[1] KAMERLINGH ONNES LAB,LEIDEN,NETHERLANDS
[2] WASHINGTON STATE UNIV,PROGRAM CHEM PHYS,PULLMAN,WA 99164
[3] UNIV PARIS 11,CTR ORSAY,PHYS SOLIDES LAB,F-91405 ORSAY,FRANCE
[4] TATA INST FUNDAMENTAL RES,BOMBAY 400005,INDIA
[5] UNIV GEORGIA,DEPT PHYS,ATHENS,GA 30602
[6] HAHN MEITNER INST KERNFORSCH BERLIN GMBH,D-1000 BERLIN 39,FED REP GER
[7] UNIV HANNOVER,INST THEORET PHYS,D-3000 HANNOVER,FED REP GER
[8] CEN,DRF,RM,F-38041 GRENOBLE,FRANCE
[9] CEN,DRF,DN,F-38041 GRENOBLE,FRANCE
[10] UNIV BASEL,INST THEORET PHYS,CH-4056 BASEL,SWITZERLAND
[11] STATE UNIV LEIDEN,INST LORENTZ,LEIDEN,NETHERLANDS
[12] INST PHYS,CH-2000 NEUCHATEL,SWITZERLAND