TY - JOUR JF - jeg JO - VL - 6 IS - 2 PY - 2013 Y1 - 2013/4/01 TI - Vol.6No.2 TT - شناسه-فارسی N2 - SP - 1 EP - 8 AD - UR - http://jeg.khu.ac.ir/article-1-406-en.html ER -