TY - JOUR T1 - 7 TT - 7 JF - jsci JO - jsci VL - 1356 IS - 2 UR - http://jsci.khu.ac.ir/article-1-1252-fa.html Y1 - 1977 SP - 0 EP - 0 KW - 7 N2 - 7 M3 ER -