T. BraunLibrary of the Hungarian Academy of Sciences Information Science and Scientometrics Research Unit (ISSRU) P.O. Box 7 H-1361 Budapest (Hungary) P.O. Box 7 H-1361 Budapest (Hungary)
A. SchubertLibrary of the Hungarian Academy of Sciences Information Science and Scientometrics Research Unit (ISSRU) P.O. Box 7 H-1361 Budapest (Hungary) P.O. Box 7 H-1361 Budapest (Hungary)