Sanz, J., Dodero, J. M. and Sánchez-Alonso, S. (2009) “A Preliminary Analysis of Software Engineering Metrics-based Criteria for the Evaluation of Learning Objects Reusability”, International Journal of Emerging Technologies in Learning (iJET), 4(s1), pp. pp. 30–34. doi: 10.3991/ijet.v4is1.794.