فهرس المقالات zahra khalifeh-zadeh المقاله 1 - An Effective Method of Feature Selection in Persian Text for Improving the Accuracy of Detecting Request in Persian Messages on Telegram 20.1001.1.23221437.2020.8.32.6.2 10.29252/jist.8.32.249 zahra khalifeh zadeh Mohammad Ali Zare Chahooki Journal of Information Systems and Telecommunication (JIST) , العدد 4 , السنة 8 , پاییز 2020