Gomez-Albarran, Mercedes, and Guillermo Jimenez-Diaz. 2009. “Recommendation and Students’ Authoring in Repositories of Learning Objects: A Case-Based Reasoning Approach”. International Journal of Emerging Technologies in Learning (iJET) 4 (March):pp. 35-40. https://doi.org/10.3991/ijet.v4i0.797.