TY - JOUR JF - jsci JO - VL - 1373 IS - 7 PY - 1994 Y1 - 1994/3/01 TI - 9 TT - 9 N2 - 9 SP - 0 EP - 0 AD - KW - 9 UR - http://jsci.khu.ac.ir/article-1-1296-fa.html ER -