Frank Berkers Jan Goossenaerts Dieter K. Hammer Hans Wortmann Human Models and Data in the Ubiquitous Information Infrastructure. 91-104 2001 conf/er/2001w ER (Workshops) http://dx.doi.org/10.1007/3-540-46140-X_8 db/conf/er/erw2001.html#BerkersGHW01