TY - JOUR T1 - 4 TT - 4 JF - jsci JO - jsci VL - 1356 IS - 1 UR - http://jsci.khu.ac.ir/article-1-1256-fa.html Y1 - 1977 SP - 0 EP - 0 KW - 4 N2 - 4 M3 ER -