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://link.springer.de/link/service/series/0558/bibs/2465/24650091.htm db/conf/er/erw2001.html#BerkersGHW01