Assisting Multimodal Travelers: Design and Prototypical Implementation of a Personal Travel Companion. - Karl Rehrl; Stefan Bruntsch; Hans-Joachim Mentz (IEEE Trans. Intell. Transp. Syst., 2007)

Smartphone-based information and navigation aids for public transport travellers. - Karl Rehrl; Nicolas Göll; Sven Leitinger; Stefan Bruntsch; Hans-Jörg Mentz (Location Based Services and TeleCartography, 2007)