Mei-Ling Shyu Kanoksri Sarinnapakorn Indika Kuruppu-Appuhamilage Shu-Ching Chen LiWu Chang Thomas Goldring Handling Nominal Features in Anomaly Intrusion Detection Problems. 55-62 2005 conf/ride/2005 RIDE http://doi.ieeecomputersociety.org/10.1109/RIDE.2005.10 db/conf/ride/ride2005.html#ShyuSKCCG05