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California Digital Library
61
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The British Library
33
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Australian National Data Service
33
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German National Library of Science and Technology
27
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MTA Könyvtára
22
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Purdue University Library
16
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GESIS - Leibniz Institute for the Social Sciences
16
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Institute for Scientific and Technical Information
9
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Office of Scientific and Technical Information (OSTI), US Department of Energy
9
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ETH Zurich
8
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German National Library of Medicine
7
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National Research Council Canada
6
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CRUI2011
5
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Swedish National Data Service
4
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TU Delft Library
3
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Technical Information Center of Denmark
3
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Tech Team's Test Allocator
2
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Deutsche Zentralbibliothek für Wirtschaftswissenschaften – Leibniz-Informationszentrum Wirtschaft
2
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CERN - European Organization for Nuclear Research
2
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Tartu University
1
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Japan Link Center
1