Cross-selling financial services to small and medium enterprises via e-banking portals. - Georg Wittmann (ECIS, 2006)

Selection of Appropriate Payment Methods for E-Government - Model and Application. - Georg Wittmann; Markus Breitschaft; Thomas Krabichler; Ernst Stahl (EGOV, 2007)

Elektronisch Einkaufen. - Ernst Stahl; Georg Wittmann (LOG IN, 2012)