[1] EXXON RES & ENGN CO,CORP RES SCI LABS,ANNANDALE,NJ 08801
[2] STANFORD UNIV,DEPT MAT SCI,STANFORD,CA 94305
[3] LAB UTILISAT RAYONNEMENT ELECTROMAGNET,F-91405 ORSAY,FRANCE
[4] UNIV SUSSEX,AFRC,NITROGEN FIXAT UNIT,BRIGHTON BN1 9RQ,E SUSSEX,ENGLAND
[5] UNIV MANCHESTER,DEPT CHEM,MANCHESTER M13 9PL,LANCS,ENGLAND