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• AMS Tesi di Laurea - Alm@DL - Università di Bologna (4)
• Applied Math and Science Education Repository - Washington - USA (2)
• ArchiMeD - Elektronische Publikationen der Universität Mainz - Alemanha (13)
• Biblioteca Valenciana Digital - Ministerio de Educación, Cultura y Deporte - Valencia - Espanha (3)
• Biodiversity Heritage Library, United States (7)
• BORIS: Bern Open Repository and Information System - Berna - Suiça (46)
• Boston University Digital Common (1)
• Brock University, Canada (4)
• CentAUR: Central Archive University of Reading - UK (1)
• Center for Jewish History Digital Collections (4)
• Digital Peer Publishing (2)
• Digital Repository at Iowa State University (1)
• Digitale Sammlungen - Goethe-Universität Frankfurt am Main (90)
• Gallica, Bibliotheque Numerique - Bibliothèque nationale de France (French National Library) (BnF), France (5)
• Harvard University (1)
• Martin Luther Universitat Halle Wittenberg, Germany (1)
• Memoria Académica - FaHCE, UNLP - Argentina (3)
• National Center for Biotechnology Information - NCBI (1)
• Plymouth Marine Science Electronic Archive (PlyMSEA) (1)
• Publishing Network for Geoscientific & Environmental Data (4)
• Queensland University of Technology - ePrints Archive (3)
• Repositório Institucional UNESP - Universidade Estadual Paulista "Julio de Mesquita Filho" (2)
• Universidad Autónoma de Nuevo León, Mexico (2)
• Universidad del Rosario, Colombia (3)
• Universidad Politécnica de Madrid (1)
• Universitätsbibliothek Kassel, Universität Kassel, Germany (10)
• Université de Montréal, Canada (3)
• University of Michigan (765)
• USA Library of Congress (2)