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IEEE Transactions on Learning Technologies > 2017 > 10 > 2 > 182 - 193
IEEE Revista Iberoamericana de Tecnologias del Aprendizaje > 2016 > 11 > 1 > 41 - 46
IEEE Latin America Transactions > 2015 > 13 > 4 > 1205 - 1209
2013 IEEE Ninth World Congress on Services > 166 - 169