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• AMS Tesi di Dottorato - Alm@DL - Università di Bologna (1)
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• Avian Conservation and Ecology - Eletronic Cientific Hournal - Écologie et conservation des oiseaux: (1)
• Biblioteca Digital | Sistema Integrado de Documentación | UNCuyo - UNCUYO. UNIVERSIDAD NACIONAL DE CUYO. (1)
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• BORIS: Bern Open Repository and Information System - Berna - Suiça (8)
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• Digitale Sammlungen - Goethe-Universität Frankfurt am Main (3)
• DRUM (Digital Repository at the University of Maryland) (1)
• Fachlicher Dokumentenserver Paedagogik/Erziehungswissenschaften (4)
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• Portal de Revistas Científicas Complutenses - Espanha (6)
• Publishing Network for Geoscientific & Environmental Data (3)
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• Repositório Institucional da Universidade Federal de São Paulo - UNIFESP (1)
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