1. Âhlberg, M. (2004), “Varieties of concept mapping. Concept maps: theory, methodology, technology”, Proceedings of the 1st International Conference on Concept Mapping, Universidad Pública de Navarra, Pamplona, Spain.
2. Alavi, M. and Leidner, D. (2001), “Knowledge management and knowledge management systems: conceptual foundations and research issues”, MIS Quarterly, Vol. 25 No. 1, pp. 107‐36.
3. Börner, K. and Chen, C. (2002), “Visual interfaces to digital libraries: motivation, utilization, and socio‐technical challenges”, Lecture Notes in Computer Science, 2539, Springer Verlag, New York, NY, pp. 1‐12.
4. Burkhard, R. and Meier, M. (2005), “Tube map visualization: evaluation of a novel knowledge visualization application for the transfer of knowledge in long‐term projects”, Journal of Universal Computer Science, Vol. 11 No. 4, pp. 473‐94.
5. Burkhard, R., Meier, M., Rodgers, P., Smis, M. and Stott, J. (2005), “Knowledge visualization: a comparative study between project tube maps and Gantt charts”, I‐Know '05, Graz, Austria, pp. 388‐95.