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• Applied Math and Science Education Repository - Washington - USA (1)
• Aston University Research Archive (1)
• BORIS: Bern Open Repository and Information System - Berna - Suiça (2)
• Brock University, Canada (3)
• Comissão Econômica para a América Latina e o Caribe (CEPAL) (4)
• DigitalCommons@University of Nebraska - Lincoln (5)
• Digitale Sammlungen - Goethe-Universität Frankfurt am Main (4)
• Ministerio de Cultura, Spain (1)
• Publishing Network for Geoscientific & Environmental Data (1)
• Universidade Federal do Rio Grande do Norte (UFRN) (1)
• University of Michigan (67)
• University of Queensland eSpace - Australia (2)