[1] BUR INT POIDS & MESURES,F-92310 SEVRES,FRANCE
[2] COUNCIL MINISTERS GERMAN DEMOCRAT REPUBL,OFF STANDARDIZAT METROL & QUAL CONTROL,BERLIN,GERMANY
[3] CZECHOSLOVAK INST METROL,BRATISLAVA,CZECHOSLOVAKIA
[4] CZECHOSLOVAK INST METROL,PRAGUE,CZECHOSLOVAKIA
[5] NATL OFF MEASURE,BUDAPEST,HUNGARY
[6] DI MENDELEEV RES METROL INST,LENINGRAD,USSR
[7] CZECHOSLOVAK ACAD SCI,CS-11142 PRAGUE 1,CZECHOSLOVAKIA