Content Provider
Cambridge University Press
3
DataCite Metadata Store (German National Library of Science and Technology)
2
Directory of Open Access Journals: DOAJ Articles
2
ScienceDirect (Elsevier - via Crossref)
2
Università degli Studi di Siena: USiena air
2
Copernicus Publications: E-Journals
1
Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia)
1
Niedersächsisches Online-Archiv NOA
1
OhioLINK: Electronic Theses and Dissertations Center
1
University of Tasmania: UTas ePrints
1
Unknown
1