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• Applied Math and Science Education Repository - Washington - USA (1)
• Archivo Digital para la Docencia y la Investigación - Repositorio Institucional de la Universidad del País Vasco (1)
• BORIS: Bern Open Repository and Information System - Berna - Suiça (2)
• CaltechTHESIS (1)
• Cambridge University Engineering Department Publications Database (1)
• CentAUR: Central Archive University of Reading - UK (1)
• Chinese Academy of Sciences Institutional Repositories Grid Portal (1)
• Digital Peer Publishing (2)
• DigitalCommons@The Texas Medical Center (1)
• DRUM (Digital Repository at the University of Maryland) (1)
• Duke University (1)
• Ministerio de Cultura, Spain (2)
• QUB Research Portal - Research Directory and Institutional Repository for Queen's University Belfast (5)
• Queensland University of Technology - ePrints Archive (6)
• Repositório Científico do Instituto Politécnico de Lisboa - Portugal (1)
• Repositório Digital da UNIVERSIDADE DA MADEIRA - Portugal (2)
• Repositório Institucional UNESP - Universidade Estadual Paulista "Julio de Mesquita Filho" (1)
• The Scholarly Commons | School of Hotel Administration; Cornell University Research (2)
• Universidade de Madeira (1)
• University of Connecticut - USA (1)