Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
3
Copernicus Publications: E-Journals
2
Directory of Open Access Journals: DOAJ Articles
2
Unknown
2
Aarhus University: Research
1
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
1
Cambridge University Press
1
Niedersächsisches Online-Archiv NOA
1
PANGAEA - Data Publisher for Earth & Environmental Science
1
SAGE Publications (via Crossref)
1
The University of Maine: DigitalCommons@UMaine
1