Modern Information Retrieval.
Ricardo Baeza-Yates and Berthier Ribeiro-Neto.
Addison-Wesley Longman. London. 1999.
http://www.sims.berkeley.edu/~hearst/irbook/

Readings in Information Visualization: Using Vision to Think.
Card, Mackinlay, Schneiderman.
Morgan Kaufmann. series in interactive technologies. San Francisco, California. 1999.

Semantic Depth of Field.
Robert Kosara and Silvia Miksch and Helwig Hauser.
IEEE Symposium on Information Visualization 2001 (InfoVis 2001).
San Diego, CA, USA. 22--23. 2001. http://citeseer.ist.psu.edu/kosara01semantic.html

Presentation of search results for the user, including summarisation and grouping of results by criteria such as relevance, language, or similarity . Graphic visualisation of large result sets in a two or threee dimensional space, making use of data visualisation techniques.