Content Provider
Aarhus University: Research
125
Directory of Open Access Journals: DOAJ Articles
94
University of St Andrews: Research Portal
86
DataCite Metadata Store (German National Library of Science and Technology)
83
Wageningen UR (University & Research Centre): Digital Library
57
Unknown
56
University of Liège: ORBi (Open Repository and Bibliography)
53
PubMed Central (PMC)
50
Wiley Online Library
44
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
43
Cambridge University Press
38
University of St Andrews: Digital Research Repository
35
Digital.CSIC (Spanish National Research Council)
33
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
30
ScienceDirect (Elsevier - via Crossref)
27
Technical University of Denmark: DTU Orbit
27
Université de Nantes: HAL-UNIV-NANTES
27
Springer Nature (via Crossref)
26
University of Copenhagen: Research
25
Utrecht University Repository
22
İstanbul Üniversitesi Açık Erişim Sistemi
21
HAL - Université de La Rochelle
20
Institut national des sciences de l'Univers: HAL-INSU
20
ScienceDirect (Elsevier)
19
HighWire Press (Stanford University)
18
Canadian Science Publishing
17
University of Southern Denmark Research Portal
17
University of the Highlands and Islands: Research Database of UHI
17
LeibnizOpen (The Leibniz Association)
16
University of Tromsø: Septentrio Academic Publishing
16
Oxford University Press
14
SRUC (Scotland's Rural College): Research Portal
14
OpenAgrar (OA)
13
Institute for Marine Research: Brage IMR
12
Canadian Science Publishing (via Crossref)
11
MDPI Open Access Publishing
11
University of Groningen research database
10
Aberdeen University Research Archive (AURA)
9
DataCite
9
TiHo eLib (University of Veterinary Medicine Hannover)
9
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
8
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
8
PLOS
8
The Royal Society
8
Zenodo
8
NIOZ Repository (Royal Netherlands Institute for Sea Research)
7
University of Tromsø: Munin Open Research Archive
7
Université de Bretagne Occidentale: HAL
7
Informa
6
Theses Canada/Thèses Canada (Library and Archives Canada)
6
more ...