Affiliation: | 1. Library and Archive Services, Bibliometrics Department, University of Vienna, Boltzmanngasse 5, 1090, Vienna, Austria 2. AIT Austrian Institute of Technology GmbH, Tech Gate Vienna, Donau-City-Stra?e 1, 1220, Vienna, Austria 3. Elsevier B.V., Radarweg 29, 1043 NX, Amsterdam, The Netherlands
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