2026-04-17T12:25:36Z https://datacatalogue.cessda.eu/oai-pmh/v0/oai language Language language:de Language de language:el Language el language:en Language en language:fi Language fi language:fr Language fr language:hr Language hr language:nl Language nl language:sl Language sl language:sl-SI Language sl-SI language:sv Language sv openaire_data OpenAIRE