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LeibnizOpen (The Leibniz Association)
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Copernicus Publications: E-Journals
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Directory of Open Access Journals: DOAJ Articles
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Niedersächsisches Online-Archiv NOA
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Publication Database PIK (Potsdam Institute for Climate Impact Research)
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Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover)
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