UbiComp 2002: Ubiquitous Computing 4th International Conference, Göteborg, Sweden, September 29 - October 1, 2002. Proceedings - Borriello, Gaetano; Borriello, Gaetano; Holmquist, Lars E.; Holmquist, Lars E. (Springer Berlin Heidelberg : Imprint: Springer, 2002)