Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
70
Defense Technical Information Center: DTIC Technical Reports database
26
LeibnizOpen (The Leibniz Association)
20
Unknown
19
Copernicus Publications: E-Journals
13
Directory of Open Access Journals: DOAJ Articles
12
Arctic Data Center (via DataONE)
11
Universitet i Oslo: Digitale utgivelser ved UiO (DUO)
11
ESS-DIVE: Deep Insight for Earth Science Data (via DataONE)
9
RePEc (Research Papers in Economics)
9
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
8
University of Bergen: Bergen Open Research Archive (BORA-UiB)
8
Wiley Online Library
8
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
7
Frontiers: Figshare
6
Niedersächsisches Online-Archiv NOA
6
Australian Nuclear Science and Technology Organisation: ANSTO Publications Online
5
Wiley Online Library (via Crossref)
5
Cambridge University Press
4
MDPI Open Access Publishing
4
Natural Environment Research Council: NERC Open Research Archive
4
Ohio State University (OSU): Knowledge Bank
4
Université de Bourgogne (UB): HAL
4
Université de Franche-Comté (UFC): HAL
4
Université de Nantes: HAL-UNIV-NANTES
4
Zenodo
4
Aarhus University: Research
3
German Aerospace Center: elib - DLR electronic library
3
Technical University of Denmark: DTU Orbit
3
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive
3
Vrije Universiteit Amsterdam (VU): Research Portal
3
De Gruyter (via Crossref)
2
Institut national des sciences de l'Univers: HAL-INSU
2
Kazan Federal University Digital Repository
2
Loughborough University: Figshare
2
Lund University Publications (LUP)
2
NORA (National aggregator of open repositories of Russian universities)
2
SAGE Publications (via Crossref)
2
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
2
The Repository of the University of Silesia (RE-BUŚ)
2
The University of Brighton Research Portal
2
University of California: eScholarship
2
University of Glasgow: Enlighten - Publications
2
University of Hertfordshire: UH Research Archive
2
University of Lethbridge Institutional Repository
2
University of North Texas: UNT Digital Library
2
University of Nottingham: Repository@Nottingham
2
University of St Andrews: Research Portal
2
University of the West of England, Bristol: UWE Research Repository
2
Université Grenoble Alpes: HAL
2
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