TY - JOUR T1 - 8 TT - 8 JF - jsci JO - jsci VL - 1373 IS - 7 UR - http://jsci.khu.ac.ir/article-1-1295-fa.html Y1 - 1994 SP - 0 EP - 0 KW - 8 N2 - 8 M3 ER -