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Query refinement is a powerful tool for a document search and retrieval system. Lexical navigation-that is, the exploration of a network thet expresses relations among all possible query terms-provides a natural mechanism for query refinement. An essential part of lexical  navigation is the visualization of this network. This manipulating a non-hierarchical  graph. In this paper, we present the graph-drawing system we have developed for lexical navigation

Lexical navigation: Using incremental graph drawing for query refinement