Shady Shehata Fakhri Karray Mohamed S. Kamel Enhancing Text Retrieval Performance using Conceptual Ontological Graph. 39-44 2006 conf/icdm/2006w ICDM Workshops http://doi.ieeecomputersociety.org/10.1109/ICDMW.2006.71 db/conf/icdm/icdmw2006.html#ShehataKK06a