TY - JOUR JF - jsci JO - VL - 1373 IS - 7 PY - 1994 Y1 - 1994/3/01 TI - 2 TT - 2 N2 - 2 SP - 0 EP - 0 AD - KW - 2 UR - http://jsci.khu.ac.ir/article-1-1289-fa.html ER -