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Directory of Open Access Journals: DOAJ Articles
2
DataCite Metadata Store (German National Library of Science and Technology)
1
Digital.CSIC (Spanish National Research Council)
1
Phaidra Digital Collections (Permanent Hosting, Archiving and Indexing of Digital Resources and Assets - Università degli Studi di Padova)
1
RACO: Revistes Catalanes amb Accés Obert
1
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