Content Provider
Frontiers: Figshare
44
Directory of Open Access Journals: DOAJ Articles
37
DataCite Metadata Store (German National Library of Science and Technology)
19
PubMed Central (PMC)
19
Springer Nature (via Crossref)
10
Unknown
8
Frontiers (Publisher)
4
University of California: eScholarship
3
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR
2
University of Massachusetts: ScholarWorks@UMass Amherst
2
ASM Journals (American Society for Microbiology - via Crossref)
1
AgroParisTech: HAL (Institut des sciences et industries du vivant et de l'environnement)
1
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
1
Archives ouvertes de Paris-Saclay
1
Canadian Science Publishing (via Crossref)
1
Carolina Digital Repository (UNC - University of North Carolina)
1
Edinburgh Napier Repository (Napier University Edinburgh)
1
Guangzhou Institute of Geochemistry: GIG OpenIR (Chinese Academy of Sciences)
1
KovsieScholar Repository (University of the Free State - UFS UV)
1
Old Dominion University: ODU Digital Commons
1
ScienceDirect (Elsevier - via Crossref)
1
Universidad de Chile: Repositorio académico
1
University of Liège: ORBi (Open Repository and Bibliography)
1
University of Tromsø: Munin Open Research Archive
1
University of Washington, Seattle: ResearchWorks
1
Uppsala University: Publications (DiVA)
1