1. Heider, J.: Vision und Realisierung einer sicheren mobilen Informations-Verteilung, Verwaltung und Abfrage. In: Multikonferenz Wirtschaftsinformatik (MKWI) 2004. Bd 3. Mobile Business Systems (2004)
2. Heider, J., Bergmann, J.: Topicmaps: Unified access to everyday data. In: Proceedings of I-KNOW 2006, Graz, Austria, pp. 473–480 (2006)
3. Wang, D., Dicheva, D., Dichev, C., Akouala, J.: Retrieving information in topic maps: the case of tm4l. In: ACM-SE 45: Proceedings of the 45th annual southeast regional conference, pp. 88–93. ACM Press, New York, NY, USA (2007)
4. Topicmaps.org: XML Topic Maps (XTM) 1.0 Specification (2001), http://www.topicmaps.org/xtm/1.0
5. Barta, R., Salzer, G.: The Tau Model, Formalizing Topic Maps. In: Hartmann, S., Stumptner, M. (eds.) Second Asia-Pacific Conference on Conceptual Modelling (APCCM 2005), Newcastle, Australia. CRPIT, vol. 43, pp. 37–42. ACS (2005), http://crpit.com/confpapers/CRPITV43Barta.pdf