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• Academic Archive On-line (Stockholm University; Sweden) (1)
• Academic Research Repository at Institute of Developing Economies (1)
• Applied Math and Science Education Repository - Washington - USA (1)
• Biblioteca Digital da Produção Intelectual da Universidade de São Paulo (1)
• Biblioteca Digital da Produção Intelectual da Universidade de São Paulo (BDPI/USP) (3)
• BORIS: Bern Open Repository and Information System - Berna - Suiça (4)
• Brock University, Canada (18)
• Bulgarian Digital Mathematics Library at IMI-BAS (1)
• CentAUR: Central Archive University of Reading - UK (13)
• Cochin University of Science & Technology (CUSAT), India (1)
• CORA - Cork Open Research Archive - University College Cork - Ireland (1)
• Digital Commons - Montana Tech (7)
• Digital Commons @ DU | University of Denver Research (2)
• Digital Commons @ Winthrop University (1)
• Digital Commons at Florida International University (2)
• DigitalCommons@The Texas Medical Center (2)
• DigitalCommons@University of Nebraska - Lincoln (1)
• Digitale Sammlungen - Goethe-Universität Frankfurt am Main (28)
• Doria (National Library of Finland DSpace Services) - National Library of Finland, Finland (5)
• Harvard University (16)
• Iowa Publications Online (IPO) - State Library, State of Iowa (Iowa), United States (60)
• Portal de Revistas Científicas Complutenses - Espanha (5)
• QUB Research Portal - Research Directory and Institutional Repository for Queen's University Belfast (1)
• Repositorio Académico de la Universidad Nacional de Costa Rica (2)
• Repositório da Produção Científica e Intelectual da Unicamp (1)
• Repositório Institucional UNESP - Universidade Estadual Paulista "Julio de Mesquita Filho" (2)
• South Carolina State Documents Depository (3)
• Universidad de Alicante (1)
• Université de Montréal, Canada (1)
• University of Michigan (648)
• University of Queensland eSpace - Australia (131)