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• Aquatic Commons (6)
• ArchiMeD - Elektronische Publikationen der Universität Mainz - Alemanha (8)
• Archive of European Integration (6)
• Biblioteca Digital da Produção Intelectual da Universidade de São Paulo (BDPI/USP) (1)
• Biodiversity Heritage Library, United States (15)
• BORIS: Bern Open Repository and Information System - Berna - Suiça (42)
• Digital Peer Publishing (1)
• Digitale Sammlungen - Goethe-Universität Frankfurt am Main (51)
• Institutional Repository of Leibniz University Hannover (1)
• Martin Luther Universitat Halle Wittenberg, Germany (2)
• Publishing Network for Geoscientific & Environmental Data (10)
• QUB Research Portal - Research Directory and Institutional Repository for Queen's University Belfast (1)
• SerWisS - Server für Wissenschaftliche Schriften der Fachhochschule Hannover (1)
• Universitätsbibliothek Kassel, Universität Kassel, Germany (391)
• Université de Lausanne, Switzerland (1)
• University of Innsbruck Digital Library - Austria (1)
• University of Michigan (67)