Content Provider
Unknown
13
DataCite Metadata Store (German National Library of Science and Technology)
9
Directory of Open Access Journals: DOAJ Articles
8
Copernicus Publications: E-Journals
7
Cambridge University Press
5
Canadian Science Publishing (via Crossref)
5
Niedersächsisches Online-Archiv NOA
5
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
4
Canadian Science Publishing
4
Institut national des sciences de l'Univers: HAL-INSU
4
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen)
4
Wiley Online Library
4
PANGAEA - Data Publisher for Earth & Environmental Science
3
PubMed Central (PMC)
3
University of Alberta: Era - Education and Research Archive
3
Université de Nantes: HAL-UNIV-NANTES
3
Érudit.org (Université Montréal)
3
Dalhousie University: DalSpace Institutional Repository
2
Ghent University Academic Bibliography
2
Harvard University: DASH - Digital Access to Scholarship at Harvard
2
Springer Nature (via Crossref)
2
University of Copenhagen: Research
2
Uppsala University: Publications (DiVA)
2
Utrecht University Repository
2
AAAS Resource Center (American Association for the Advancement of Science)
1
Aarhus University: Research
1
Archive Ouverte de l'Université Rennes (HAL)
1
Columbia University: Academic Commons
1
Defense Technical Information Center: DTIC Technical Reports database
1
Delft University of Technology: Institutional Repository
1
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
1
Florida State University Digital Library (FSUDL)
1
Florida State University: DigiNole Commons
1
HELDA – University of Helsinki Open Repository
1
Lund University Publications (LUP)
1
MDPI Open Access Publishing
1
National Research Council Canada: NRC Publications Archive
1
Northern Illinois University (NIU): Huskie Commons Repository
1
Opin vísindi (Iceland)
1
Purdue University: e-Pubs
1
ScienceDirect (Elsevier - via Crossref)
1
Stockholm University: Publications (DiVA)
1
Technical University of Denmark: DTU Orbit
1
Texas State University: Digital Collections Repository
1
The Royal Society
1
University College London: UCL Discovery
1
University of Bergen: Bergen Open Research Archive (BORA-UiB)
1
University of Calgary Journal Hosting
1
University of Lincoln: Lincoln Repository
1
University of Tromsø: Munin Open Research Archive
1
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