Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
17,788
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas)
4
Universitäts- und Landesbibliothek Sachsen-Anhalt: Bibliotheca Ponickaviana
4
North Dakota State University (NDSU): Digital Horizons
2
ScienceDirect (Elsevier - via Crossref)
2
Share it - Open Access und Forschungsdaten-Repositorium der Hochschulbibliotheken in Sachsen-Anhalt
2
University of Washington, Seattle: Digital Collections
2
ASI Research Portal (Arkansas Studies Institute Catalog)
1
Center for Jewish History: Digital Collections
1
Claremont Colleges Digital Library (CCDL)
1
Colecciones digitales - Biblioteca Virtual del Banco de la República
1
Directory of Open Access Journals: DOAJ Articles
1
Frankfurt/Main University Library: Digitale Sammlungen
1
Hathi Trust Digital Library
1
The University of Utah: J. Willard Marriott Digital Library
1
The digital State Library of Upper Austria (oö)
1
University of Lethbridge Digitized Collections
1
University of Tartu: ojs.utlib.ee
1
University of Tromsø: Munin Open Research Archive
1
University of Tromsø: Septentrio Academic Publishing
1
Washington State University: WSU Libraries Digital Collections
1
Wiley Online Library
1