A GIS-aware Architecture for Tourism Portal. - Müller, Bernd; Wehr, Harald; Voigt, Björn (2004)

Development of Web Portals concerning Spatial Information. - Müller, Bernd; Voigt, Björn; Wehr, Harald (2003)

Providing Uniform Access to Heterogeneous Sources - A Positional Paper. - Wehr, Harald; Müller, Bernd (2002)