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H. Kwak, C. Lee, H. Park, and S. Moon. WWW '10: Proceedings of the 19th international conference on World wide web, page 591--600. New York, NY, USA, ACM, (2010)
S. Göbel, M. Heidemann, U. Jasnoch, and G. Stumme. Hypermedia im Umweltschutz. 3. Workshop in Ulm 2000, Umwelt-Informatik aktuell, Bd. 24, page 169-179. Marburg, (2000)
S. Göbel, M. Heidemann, U. Jasnoch, and G. Stumme. Hypermedia im Umweltschutz. 3. Workshop in Ulm 2000, Umwelt-Informatik aktuell, Bd. 24, page 169-179. Marburg, (2000)