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Fábio Silva, Cesar Analide, Luís Rosa, Gilberto Felgueiras, Cedric Pimenta (2013). "Gamification, Social Networks and Sustainable Environments", International Journal of Interactive Multimedia and Artificial Intelligence, vol. 2, issue Regular Issue, no. 4, pp. 52-59. https://doi.org/10.9781/ijimai.2013.246