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• ArchiMeD - Elektronische Publikationen der Universität Mainz - Alemanha (1)
• Biblioteca Digital | Sistema Integrado de Documentación | UNCuyo - UNCUYO. UNIVERSIDAD NACIONAL DE CUYO. (1)
• CentAUR: Central Archive University of Reading - UK (1)
• Digitale Sammlungen - Goethe-Universität Frankfurt am Main (3)
• Fachlicher Dokumentenserver Paedagogik/Erziehungswissenschaften (2)
• Indian Institute of Science - Bangalore - Índia (9)
• National Center for Biotechnology Information - NCBI (1)
• Plymouth Marine Science Electronic Archive (PlyMSEA) (1)
• Portal de Revistas Científicas Complutenses - Espanha (1)
• Publishing Network for Geoscientific & Environmental Data (1)
• QUB Research Portal - Research Directory and Institutional Repository for Queen's University Belfast (2)
• Queensland University of Technology - ePrints Archive (17)
• Universitätsbibliothek Kassel, Universität Kassel, Germany (1)
• Université de Montréal, Canada (2)
• University of Connecticut - USA (1)
• University of Michigan (25)
• USA Library of Congress (1)