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IEEE Revista Iberoamericana de Tecnologias del Aprendizaje > 2015 > 10 > 2 > 60 - 68
IEEE Transactions on Audio, Speech, and Language Processing > 2011 > 19 > 3 > 538 - 548
IEEE Transactions on Knowledge and Data Engineering > 2017 > 29 > 8 > 1639 - 1652