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IEEE Internet of Things Journal > 2016 > 3 > 5 > 735 - 744
IEEE Revista Iberoamericana de Tecnologias del Aprendizaje > 2016 > 11 > 1 > 41 - 46
IEEE Transactions on Learning Technologies > 2016 > 9 > 1 > 37 - 45
IEEE Transactions on Visualization and Computer Graphics > 2012 > 18 > 4 > 565 - 572