[2] Ricardo A. Baeza-Yates, Berthier Ribeiro-Neto,: Modern Information Retrieval, Addison-Wesley Longman Publishing Co., Inc., Boston, MA. (1999)
[3] Jones, S. and Mclnnes, S. A Graphical User Interface for Boolean Query Specification. Working Paper 97⁄31, Department of Computer Science, University of Waikato, Hamilton, New Zealand, 1997. Submitted to International Journal on Digital Libraries.
[4] Williamson, C., Shneiderman, B.: The dynamic HomeFinder: evaluating dynamic queries in a real-estate information exploration system, Proceedings of the 15th annual international ACM SIGIR conference on Research and development in information retrieval, pp.338-346, June 21-24,.(1992)
[5] Schneiderman, B.: Dynamic Queries for Visual Information Seeking; IEEE Software, v.11 n.6, pp.70-77. (1994)