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Building this mental model can be challenging as it requires not only finding relevant documents but also synthesizing important concepts and the relationships that connect those concepts both within and across documents. This article describes a novel interactive approach designed to help users construct a mental model of an unfamiliar information space during exploratory search. We propose a new semantic search system to organize and visualize important concepts and their relations for a set of search results. A user study (<jats:italic>n<\/jats:italic>=20) was conducted to compare the proposed approach against a baseline faceted search system on exploratory literature search tasks. 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