Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
43
Directory of Open Access Journals: DOAJ Articles
40
Unknown
39
National Institute of Polar Research Repository, Japan
23
PANGAEA - Data Publisher for Earth & Environmental Science
19
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
17
Copernicus Publications: E-Journals
12
WikiBooks - Open-content textbooks
12
Informa
11
Informa (via Crossref)
10
Institut national des sciences de l'Univers: HAL-INSU
9
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
8
Defense Technical Information Center: DTIC Technical Reports database
7
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
7
University of Southampton: e-Prints Soton
7
Niedersächsisches Online-Archiv NOA
6
PubMed Central (PMC)
6
Université de Nantes: HAL-UNIV-NANTES
6
Apollo - University of Cambridge Repository
5
Opin vísindi (Iceland)
5
Biodiversity Heritage Library (BHL)
4
Cambridge University Press
4
Digital.CSIC (Spanish National Research Council)
4
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives)
4
Natural Environment Research Council: NERC Open Research Archive
4
The University of Manchester: Research Explorer
4
University of Stirling: Stirling Digital Research Repository
4
Université de Genève: Archive ouverte UNIGE
4
Wiley Online Library (via Crossref)
4
Zenodo
4
BORIS (Bern Open Repository and Information System, University of Bern)
3
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas)
3
Delft University of Technology: Institutional Repository
3
Magnolia press
3
Nanjing Institute of Geology and Palaeontology: NIGPAS OpenIR (Chinese Academy of Sciences)
3
Springer Nature (via Crossref)
3
University of Bristol: Bristol Research
3
University of California: eScholarship
3
University of Canterbury, Christchurch: UC Research Repository
3
University of Copenhagen: Research
3
University of Leicester: Leicester Research Archive (LRA)
3
University of Tromsø: Munin Open Research Archive
3
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ
3
Aarhus University: Research
2
Archive de l'Observatoire de Paris (HAL)
2
C-RECS (Creative - Repository of Electro Communications)
2
DIAL@UCLouvain (Université catholique de Louvain)
2
DIAL@USL-B (Université Saint-Louis, Bruxelles)
2
EPHE (Ecole pratique des hautes études, Paris): HAL
2
Florida Online Journals (FloridaOJ)
2
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