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  1. Tzitzikas, Y.; Spyratos, N.; Constantopoulos, P.; Analyti, A.: Extended faceted ontologies (2002) 10.31 
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  2. Tzitzikas, Y.: Collaborative ontology-based information indexing and retrieval (2002) 10.31 
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  3. Fafalios, P.; Tzitzikas, Y.: Stochastic reranking of biomedical search results based on extracted entities (2017) 10.31 
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