Amine Abdelmalek Zakaria Elberrichi Ladjel Bellatreche Michel Simonet Mimoun Malki Concept-based clustering of textual documents using SOM. 156-163 2008 AICCSA http://dx.doi.org/10.1109/AICCSA.2008.4493530 conf/aiccsa/2008 db/conf/aiccsa/aiccsa2008.html#AbdelmalekEBSM08