Hamou Reda Mohamed, Lokbani Ahmed Chaouki, Ahmed Lehireche, and Rahmani Mohamed. “TEXT CLUSTERING BASED ON THE N-GRAMS BY BIO INSPIRED METHOD (IMMUNE SYSTEMS)”. Researchers World - International Refereed Social Sciences Journal, vol. 1, no. 1, Aug. 2021, pp. 56-70, https://www.researchersworld.com/index.php/rworld/article/view/122.