1. Agirre, E., Alfonseca, E., Lopez, O.: Approximating Hierarchy-based Similarity for WordNet Nominal Synsets Using Topic Signatures. In: Global WordNet Conf. (2004)
2. Al-Kamha, R., Embley, D.W.: Grouping search-engine returned citations for person-name queries. In: WIDM 2004 (2004)
3. Beitzel, S.: Varying Approaches to Topical Web Query Classification. In: ACM SIGIR (2007)
4. de Luca, E., Nürnberger, A., von Guericke, O.: Ontology-Based Semantic Online Classification of Documents: Supporting Users in Searching the Web. University of Magdeburg, Germany (2004)
5. de Simone, T., Kazakov, D.: Using WordNet Similarity and Antonymy Relations to Aid Document Retrieval. Recent Advances in Natural Language Processing, RANLP (2005)