Affiliation: | (1) Center for Science Studies, University Bielefeld, P.O.B. 8640, W-4800 Bielefeld 1, (Germany);(2) Social Sciences Information Centre, Lennéstraße 30, W-5300 Bonn 1, (Germany);(3) Present address: Library of the Hungarian Academy of Sciences, Information Science and Scientometrics Research Unit (ISSRU), P.O.B. 7, H-1361 Budapest, Hungary |