TY - JOUR JF - jsci JO - VL - 1356 IS - 1 PY - 1977 Y1 - 1977/12/01 TI - 8 TT - 8 N2 - 8 SP - 0 EP - 0 AD - KW - 8 UR - http://jsci.khu.ac.ir/article-1-1260-fa.html ER -