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• AMS Tesi di Laurea - Alm@DL - Università di Bologna (1)
• Applied Math and Science Education Repository - Washington - USA (4)
• Archive of European Integration (6)
• Biodiversity Heritage Library, United States (83)
• BORIS: Bern Open Repository and Information System - Berna - Suiça (5)
• Brock University, Canada (18)
• Bucknell University Digital Commons - Pensilvania - USA (1)
• CentAUR: Central Archive University of Reading - UK (2)
• Comissão Econômica para a América Latina e o Caribe (CEPAL) (2)
• Dalarna University College Electronic Archive (1)
• Digital Commons @ DU | University of Denver Research (1)
• DigitalCommons@The Texas Medical Center (4)
• Digitale Sammlungen - Goethe-Universität Frankfurt am Main (1)
• Harvard University (7)
• Iowa Publications Online (IPO) - State Library, State of Iowa (Iowa), United States (24)
• Universidad del Rosario, Colombia (3)
• Université de Lausanne, Switzerland (1)
• University of Connecticut - USA (1)
• University of Michigan (834)
• USA Library of Congress (1)