TY - JOUR JF - jsci JO - VL - 1356 IS - 1 PY - 1977 Y1 - 1977/12/01 TI - 6 TT - 6 N2 - 6 SP - 0 EP - 0 AD - KW - 6 UR - http://jsci.khu.ac.ir/article-1-1258-fa.html ER -