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• AMS Tesi di Dottorato - Alm@DL - Università di Bologna (1)
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• Archivo Digital para la Docencia y la Investigación - Repositorio Institucional de la Universidad del País Vasco (1)
• Biblioteca Digital da Produção Intelectual da Universidade de São Paulo (1)
• Biblioteca Valenciana Digital - Ministerio de Educación, Cultura y Deporte - Valencia - Espanha (1)
• BORIS: Bern Open Repository and Information System - Berna - Suiça (1)
• Brock University, Canada (4)
• Bulgarian Digital Mathematics Library at IMI-BAS (1)
• CentAUR: Central Archive University of Reading - UK (7)
• Dalarna University College Electronic Archive (2)
• Digital Archives@Colby (1)
• Digital Commons - Montana Tech (1)
• Digital Commons @ DU | University of Denver Research (1)
• Digital Commons at Florida International University (8)
• DigitalCommons@University of Nebraska - Lincoln (1)
• DRUM (Digital Repository at the University of Maryland) (2)
• Gallica, Bibliotheque Numerique - Bibliothèque nationale de France (French National Library) (BnF), France (1)
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• Indian Institute of Science - Bangalore - Índia (2)
• Ministerio de Cultura, Spain (10)
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• Portal de Revistas Científicas Complutenses - Espanha (1)
• Publishing Network for Geoscientific & Environmental Data (34)
• QUB Research Portal - Research Directory and Institutional Repository for Queen's University Belfast (27)
• Queensland University of Technology - ePrints Archive (7)
• Repositorio Institucional de la Universidad de El Salvador (2)
• Repositorio Institucional de la Universidad Nacional Agraria (1)
• Repositório Institucional UNESP - Universidade Estadual Paulista "Julio de Mesquita Filho" (1)
• SAPIENTIA - Universidade do Algarve - Portugal (2)
• Universidad del Rosario, Colombia (2)
• Universidad Politécnica de Madrid (1)
• Universidade Metodista de São Paulo (1)
• Université de Montréal (1)
• Université de Montréal, Canada (2)
• University of Michigan (130)
• University of Southampton, United Kingdom (12)