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IEEE Transactions on Software Engineering > 2015 > 41 > 7 > 661 - 690
IEEE Revista Iberoamericana de Tecnologias del Aprendizaje > 2015 > 10 > 1 > 1 - 2
IEEE Transactions on Software Engineering > 2015 > 41 > 1 > 40 - 64
IEEE Software > 2015 > 32 > 1 > 58 - 66