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ZDB
The German Union Catalogue of Serials (Zeitschriftendatenbank, ZDB ) offers access to 1.6 M metadata records about bibliographic resources (journals, newspapers, other... -
OANetzwerk
This is the Linked Open Data Service from the Open Access Network Project. For more details see http://www.dini.de/projekte/oa-netzwerk/ or http://www.dini.de/english/ and the...