Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
54,188
ScienceDirect (Elsevier - via Crossref)
1,294
PANGAEA - Data Publisher for Earth & Environmental Science
1,184
Wiley Online Library
498
Wiley Online Library (via Crossref)
463
Cambridge University Press
456
SAGE Publications
431
SAGE Publications (via Crossref)
370
ScienceDirect (Elsevier)
342
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
277
Directory of Open Access Journals: DOAJ Articles
270
Nanjing Institute of Geology and Palaeontology: NIGPAS OpenIR (Chinese Academy of Sciences)
266
Informa (via Crossref)
263
Texas Tech University: TTU DSpace Repository
262
Université de Nantes: HAL-UNIV-NANTES
210
BioOne Online Journals
182
Cambridge University Press (via Crossref)
148
Biodiversity Heritage Library (BHL)
131
Informa
126
Springer Nature (via Crossref)
122
Institut national des sciences de l'Univers: HAL-INSU
121
Unknown
121
University of California: eScholarship
104
Utrecht University Repository
101
HAL Sorbonne Université
94
JSTOR (via Crossref)
81
Muséum National d'Histoire Naturelle (MNHM): HAL
72
Schweizerbart Science Publishers (via Crossref)
66
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive
61
JSTOR
53
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas)
47
Aix-Marseille Université: HAL
42
EPHE (Ecole pratique des hautes études, Paris): HAL
42
HAL Lyon 1 (University Claude Bernard Lyon 1)
40
Université de Lyon: HAL
40
American Museum of Natural History: AMNH scientific publications
34
Scandinavian University Press (via Crossref)
34
University of Tromsø: Munin Open Research Archive
33
Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences)
32
Zenodo
32
Hathi Trust Digital Library
31
ARPI - Archivio della Ricerca dell'Università di Pisa
30
Defense Technical Information Center: DTIC Technical Reports database
29
Université de Bourgogne (UB): HAL
28
Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires)
27
Collège de France: HAL
26
NORA (National aggregator of open repositories of Russian universities)
26
Swedish National Data Service (SND)
26
Université de Montpellier: HAL
26
CyberLeninka (Scientific Electronic Library)
25
more ...