Proceedings of the IADIS International Conference on Cognition and Exploratory Learning in Digital Age (CELDA 2005): Porto, Portugal, December 14-16, 2005
coord. por Kinshuk Kinshuk, Demetrios Sampson, Pedro Isaías, Luís Rodrigues, Patrícia Barbosa
IADIS (International Association for Development of the Information Society), 2005. ISBN 972-8924-05-4
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