Content Provider
Copernicus Publications: E-Journals
133
Unknown
43
MDPI Open Access Publishing
20
PubMed Central (PMC)
17
DataCite Metadata Store (German National Library of Science and Technology)
8
Defense Technical Information Center: DTIC Technical Reports database
3
HighWire Press (Stanford University)
2
University of Pennsylvania: ScholaryCommons@Penn
2
BioOne Online Journals
1
University of Alabama Institutional Repository
1
University of Nebraska-Lincoln: DigitalCommons@UNL
1
eCite UTAS (University of Tasmania)
1