Reda Mohamed Hamou Ahmed Lehireche Ahmed Chaouki Lokbani Mohamed Rahmani Representation of textual documents by the approach wordnet and n-grams for the unsupervised classification (clustering) with 2D cellular automata: a comparative study. 240-255 2010 3 Computer and Information Science 3 http://journal.ccsenet.org/index.php/cis/article/view/5012 db/journals/ccsecis/ccsecis3.html#HamouLLR10