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IEEE Transactions on Computers > 2016 > 65 > 1 > 42 - 52
IEEE Transactions on Knowledge and Data Engineering > 2015 > 27 > 9 > 2349 - 2361
IEEE Transactions on Knowledge and Data Engineering > 2015 > 27 > 9 > 2480 - 2493
IEEE Revista Iberoamericana de Tecnologias del Aprendizaje > 2015 > 10 > 3 > 119 - 125