1. Location-Based Services: The State of the Art
2. Activity theory: History, research and application
3. Media spaces
4. Jachner, J., Petrack, S., Darmois, E. and Ozugur, T. (2005), “Rich presence: a new user communications experience”, technical whitepaper,Alcatel Telecommunications Review, 1st quarter, vol. 1, pp. 73‐7, available at: www.ucstrategies.com/uploadedFiles/UC_Information/White_Papers/Alcatel%20Rich_presence‐EN.pdf
5. Ubiquitous presence systems