User centered technologies research institute. - Guido Kempter; Miglena Dontschewa; Philipp von Hellberg; Karl-Heinz Weidmann (CHI Extended Abstracts, 2004)

Interregional Differences in User Cognition: A Practical Approach for Information Architecture. - Philipp von Hellberg; Walter Ritter; Guido Kempter (USAB, 2006)