R. J�schke, A. Hotho, C. Schmitz, and G. Stumme. Proc. 18. Workshop Grundlagen von Datenbanken, page 80-84. Halle-Wittenberg, Martin-Luther-Universit�t, (June 2006)
C. Jorgensen. Proceedings 18th Workshop of the American Society for Information
Science and Technology Special Interest Group in Classification Research,
Milwaukee, Wisconsin, (2007)
G. Tummarello, and C. Morbidoni. Workshop on Social and Collaborative Construction of Structured Knowledge
at 16th International World Wide Web Conference (WWW2007), (2007)