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• Academic Archive On-line (Stockholm University; Sweden) (1)
• AMS Tesi di Laurea - Alm@DL - Università di Bologna (4)
• Aquatic Commons (1)
• Biblioteca Digital da Produção Intelectual da Universidade de São Paulo (1)
• BORIS: Bern Open Repository and Information System - Berna - Suiça (5)
• Brock University, Canada (1)
• Bulgarian Digital Mathematics Library at IMI-BAS (1)
• CentAUR: Central Archive University of Reading - UK (6)
• Digitale Sammlungen - Goethe-Universität Frankfurt am Main (12)
• Duke University (4)
• Helda - Digital Repository of University of Helsinki (1)
• Indian Institute of Science - Bangalore - Índia (5)
• National Center for Biotechnology Information - NCBI (17)
• Portal de Revistas Científicas Complutenses - Espanha (1)
• Publishing Network for Geoscientific & Environmental Data (3)
• QUB Research Portal - Research Directory and Institutional Repository for Queen's University Belfast (6)
• Queensland University of Technology - ePrints Archive (1)
• Repositório Institucional UNESP - Universidade Estadual Paulista "Julio de Mesquita Filho" (13)
• Universidad del Rosario, Colombia (4)
• Universidad Politécnica de Madrid (2)
• Université de Lausanne, Switzerland (1)
• University of Michigan (22)
• University of Washington (2)