1. Austin, J. L. (1976) How to Do Things with Words. Oxford: Oxford University Press.
2. Beaudouin-Lafon, M. (unpublished) Instrumental Interaction: a New Model for Graphical User Interfaces. Department of Computer Science, University of Aarhus.
3. Blizzard Entertainment (1998) Starcraft. http: //www.blizzard. com/starcraft/.
4. Begh Andersen, P. (1992) Vector spaces as the basic component of interactive systems. Towards a computer semiotics. Hypermedia 4 (1): 53–76.
5. Begh Andersen, P. (1995a) The force dynamics of interactive system. Towards a computer semiotics. Semiotica 103 (1/2): 5–45.