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Directory of Open Access Journals: DOAJ Articles
3
Lund University Publications (LUP)
2
University of Calgary Journal Hosting
2
DataCite Metadata Store (German National Library of Science and Technology)
1
Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia)
1
Max Planck Society: MPG.PuRe
1
Polar Research
1
Sapienza Università di Roma: CINECA IRIS
1
University College London: UCL Discovery
1
University of Copenhagen: Research
1
Unknown
1