TY - JOUR T1 - 2 TT - 2 JF - jsci JO - jsci VL - 1374 IS - 8 UR - http://jsci.khu.ac.ir/article-1-1305-en.html Y1 - 1996 SP - 0 EP - 0 KW - 2 N2 - 2 M3 ER -