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IEEE Transactions on Education > 2017 > 60 > 1 > 22 - 28
IEEE Transactions on Information Theory > 2016 > 62 > 9 > 4873 - 4878
IEEE Revista Iberoamericana de Tecnologias del Aprendizaje > 2016 > 11 > 3 > 146 - 147
IEEE Transactions on Education > 2016 > 59 > 1 > 17 - 23