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Scientific and Technical Information Processing > 2017 > 44 > 2 > 107-118
IEEE Revista Iberoamericana de Tecnologias del Aprendizaje > 2017 > 12 > 3 > 147 - 155
Scientific and Technical Information Processing > 2017 > 44 > 2 > 107-118
IEEE Revista Iberoamericana de Tecnologias del Aprendizaje > 2017 > 12 > 3 > 147 - 155