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DataCite Metadata Store (German National Library of Science and Technology)
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EconStor (German National Library of Economics, ZBW)
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OPUS FAU - Online publication system of Friedrich-Alexander-Universität Erlangen-Nürnberg
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ScienceDirect (Elsevier - via Crossref)
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TUHH Open Research (TORE - Technische Universität Hamburg)
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