KULES, Bill. Categorized graphical overviews for web search results : An exploratory study using U.S. government agencies as a meaningful and stable structure. Proceedings of the Third Annual Workshop on HCI Research in MIS, Washington, D.C., December 10-11, 2004. 2004
RIVADENEIRA, Walkey. A Study of Search Result Clustering Interfaces : Comparing Textual and Zoomable User Interfaces. Journal University of Maryland HCIL Technical Report. 2003, HCIL-2003-36