Xaudio: Results from a Field Trial Study on a Technology Enhancing Radio Listeners' User Experience. - Reinhard Sefelin; Verena Seibert-Giller; Manfred Tscheligi (Mobile HCI, 2004)

Landmarks: yes; but which?: five methods to select optimal landmarks for a landmark- and speech-based guiding system. - Reinhard Sefelin; Michael Bechinie; Regine Müller; Verena Seibert-Giller; Peter Messner; Manfred Tscheligi (Mobile HCI, 2005)