Content Provider
Unknown
19
Oxford University Press (via Crossref)
16
WikiBooks - Open-content textbooks
13
PubMed Central (PMC)
9
DataCite Metadata Store (German National Library of Science and Technology)
8
Directory of Open Access Journals: DOAJ Articles
8
University of Copenhagen: Research
8
Cambridge University Press
6
De Gruyter (via Crossref)
6
Wiley Online Library
6
Max Planck Society: MPG.PuRe
5
University of California: eScholarship
5
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
4
Aix-Marseille Université: HAL
3
HighWire Press (Stanford University)
3
Informa (via Crossref)
3
James Cook University, Australia: ResearchOnline@JCU
3
John Benjamins Publishing Company (via Crossref)
3
University of Chicago Press (via Crossref)
3
Universitá degli Studi di Roma "Tor Vergata": ART - Archivio Istituzionale della Ricerca
3
Université de Nantes: HAL-UNIV-NANTES
3
Arca (BC's Digital Treasures)
2
CQUniversity: acquire
2
CyberLeninka (Scientific Electronic Library)
2
DigiZeitschriften: The German digital journal archive (Göttingen University Library)
2
Harvard University: DASH - Digital Access to Scholarship at Harvard
2
IRIS UNIPV (Università degli studi di Pavia)
2
JSTOR (via Crossref)
2
Oxford University Press
2
Université de Genève: Archive ouverte UNIGE
2
Érudit.org (Université Montréal)
2
AAAS Resource Center (American Association for the Advancement of Science - via Crossref)
1
ADDI: Repositorio Institucional de la Universidad del País Vasco (UPV)
1
Aarhus University: OJS at The State and University Library
1
Aarhus University: Research
1
Aichi Gakusen University Aichi Gakusen College Repository
1
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas)
1
COS Center for Open Science
1
Carroll College: Carroll Scholars
1
De Gruyter
1
Directory of Open Access Books (DOAB)
1
Federation of Finnish Learned Societies: Scientific Journals Online
1
HAL-EHESS : Le portail HAL de l'École des hautes études en sciences sociales
1
Hacettepe University Research Information System
1
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP)
1
Hrčak - Portal of scientific journals of Croatia
1
Hungarian Electronic Library (MEK)
1
IRIS Università degli Studi di Perugia
1
Institut für Deutsche Sprache: Publikationsserver
1
Jagiellonian University Repository
1
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