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IEEE Transactions on Learning Technologies > 2017 > 10 > 4 > 419 - 435
IEEE Revista Iberoamericana de Tecnologias del Aprendizaje > 2016 > 11 > 1 > 33 - 40
2010 IEEE Frontiers in Education Conference (FIE) > F3G-1 - F3G-2
IEEE EDUCON 2010 Conference > 423 - 428