Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
16
Unknown
5
Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires)
3
Directory of Open Access Journals: DOAJ Articles
3
Natural Environment Research Council: NERC Open Research Archive
3
Australian National University: ANU Digital Collections
2
De Gruyter (via Crossref)
2
Nanjing Institute of Geology and Palaeontology: NIGPAS OpenIR (Chinese Academy of Sciences)
2
National Institute of Polar Research Repository, Japan
2
PANGAEA - Data Publisher for Earth & Environmental Science
2
Biblioteca Digital de Periódicos da UFPR (Universidade Federal do Paraná)
1
Digital.CSIC (Spanish National Research Council)
1
Dresden University of Technology: Qucosa
1
Electrical Engineering and Power Engineering (EE&PE - E-Journal)
1
Electronic Theses of LMU Munich (Ludwig-Maximilians-Universität)
1
HighWire Press (Stanford University)
1
Institutional Repository of Leibniz Universität Hannover
1
Polar Research (E-Journal)
1
Scientific Periodicals of Ukraine (Ukrainian Research and Academic Network)
1
The University of Texas at Austin: Texas ScholarWorks
1
Vernadsky National Library of Ukraine: DSpace
1
White Rose eTheses Online (Universities Leeds, Sheffield, York)
1
Wiley Online Library
1
Wiley Online Library (via Crossref)
1