TY - JOUR JF - jsci JO - VL - 1356 IS - 2 PY - 1977 Y1 - 1977/8/01 TI - 1 TT - 1 N2 - 1 SP - 0 EP - 0 AD - KW - 1 UR - http://jsci.khu.ac.ir/article-1-1246-fa.html ER -