TY - JOUR T1 - 3 TT - 3 JF - jsci JO - jsci VL - 1356 IS - 2 UR - http://jsci.khu.ac.ir/article-1-1248-en.html Y1 - 1977 SP - 0 EP - 0 KW - 3 N2 - 3 M3 ER -