TY - JOUR JF - jsci JO - VL - 1373 IS - 6 PY - 1994 Y1 - 1994/9/01 TI - 3 TT - 3 N2 - 3 SP - 0 EP - 0 AD - KW - 3 UR - http://jsci.khu.ac.ir/article-1-1299-fa.html ER -