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Tzitzikas, Y.; Spyratos, N.; Constantopoulos, P.; Analyti, A.: Extended faceted ontologies (2002)
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Tzitzikas, Y.: Collaborative ontology-based information indexing and retrieval (2002)
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Fafalios, P.; Tzitzikas, Y.: Stochastic reranking of biomedical search results based on extracted entities (2017)
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