TY - JOUR T1 - 6 TT - 6 JF - jsci JO - jsci VL - 1372 IS - 5 UR - http://jsci.khu.ac.ir/article-1-1283-en.html Y1 - 1993 SP - 0 EP - 0 KW - 6 N2 - 6 M3 ER -