Shaping PortalU®/InGrid® to Meet the INSPIRE Requirements - First Experiences and Some Considerations on How to Efficiently Organize the German Spatial Data Infrastructure as INSPIRE Node. - Martin Klenke; Fred A. Kruse; Stefanie Uhrich; Christiane Giffei; Sybille Peters (EnviroInfo, 2008)

Einbindung von Kommunen in das Umweltportal Deutschland am Beispiel des Kommunalen PortalU® Niedersachsens. - Fred A. Kruse; Martin Klenke; Stefanie Uhrich; Christiane Giffei; Sybille Peters (EnviroInfo, 2008)

The Information Technology of the German Environmental Information Portal PortalU® as Tool for the European Level? - Stefanie Uhrich; Fred A. Kruse; Martin Klenke; Christiane Giffei; Sybille Peters (EnviroInfo, 2008)

A New Approach Towards Vertical Search Engines - Intelligent Focused Crawling and Multilingual Semantic Techniques. - Sybille Peters; Claus-Peter Rückemann; Wolfgang Sander-Beuermann (WEBIST (2), 2010)