1. Baldoni, M., Baroglio, C., Patti, V.: Reasoning about learning object metadata for adapting SCORM courseware. In: Aroyo, L., Tasso, C. (eds.) AH 2004: Workshop Proceedings, Part I, International Workshop on Engineering the Adaptive Web, EAW 2004: Methods and Technologies for personalization and Adaptation in the Semantic Web, Eindhoven, The Netherlands, August 2004, pp. 4–13 (2004)
2. Bassiliades, N., Kokkoras, F., Vlahavas, I., Sampson, D.: An Intelligent Educational Metadata Repository. In: Leondes, C.T. (ed.) Intelligent Systems, Techniques and Applications, vol. 4, ch. 12, pp. 297–337. CRC Press, Boca Raton (2003)
3. Lecture Notes in Computer Science;N. Bassiliades,2004
4. Currie, K., Tate, A.: O-Plan: The Open Planning Architecture. Artificial Intelligence 52(1), 46–86 (1991)
5. Erol, K., Hendler, J., Nau, D.: UMCP: A Sound and Complete Procedure for Hierarchical Task Network Planning. In: Proceedings of the 2nd International Conference on Planning Systems, Chicago, Illinois, pp. 88–96 (1994)