TY - JOUR T1 - 6 TT - 6 JF - jsci JO - jsci VL - 1375 IS - 9 UR - http://jsci.khu.ac.ir/article-1-1320-fa.html Y1 - 1996 SP - 0 EP - 0 KW - 6 N2 - 6 M3 ER -