Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
3
Directory of Open Access Journals: DOAJ Articles
3
National Institute of Polar Research Repository, Japan
2
Unknown
2
Columbia University: Academic Commons
1
Ghent University Academic Bibliography
1
HighWire Press (Stanford University)
1
Hindawi Publishing Corporation
1
Indian Institute of Geomagnetism (IIG): Repository
1
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen)
1
Natural Environment Research Council: NERC Open Research Archive
1
The Winnower
1