TY - JOUR T1 - 6 TT - 6 JF - jsci JO - jsci VL - 1373 IS - 6 UR - http://jsci.khu.ac.ir/article-1-1302-en.html Y1 - 1994 SP - 0 EP - 0 KW - 6 N2 - 6 M3 ER -