Andre Bortolon Hugo Cesar Hoeschl Christianne C. S. R. Coelho Tânia C. D'Agostini Bueno A Model for Concepts Extraction and Context Identification in Knowledge Based Systems. 181-190 2006 conf/clor/2006 IFIP PPAI http://dx.doi.org/10.1007/978-0-387-34749-3_19 db/conf/ifip12/ppai2006.html#BortolonHCB06