Arzucan Özgür Tunga Güngör Classification of Skewed and Homogenous Document Corpora with Class-Based and Corpus-Based Keywords. 91-101 2006 conf/ki/2006 KI http://dx.doi.org/10.1007/978-3-540-69912-5_8 db/conf/ki/ki2006.html#OzgurG06