Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
7
Unknown
5
University of Washington, Seattle: Digital Collections
4
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
3
USGS Science Data Catalog (via DataONE)
3
Chalmers University of Technology: Chalmers research
2
The University of Melbourne: Digitised Collections
2
Zenodo
2
Cambridge University Press
1
IOP Publishing
1
IOP Publishing (via Crossref)
1
Max Planck Society: MPG.PuRe
1
National Library of Australia: Digital Collections
1
Naval Postgraduate School: Calhoun
1
North Dakota State University (NDSU): Digital Horizons
1
Oxford University Press (via Crossref)
1
Queensland University of Technology: QUT ePrints
1
RePEc (Research Papers in Economics)
1
University of Nebraska-Lincoln: DigitalCommons@UNL
1
University of Wollongong, Australia: Research Online
1