TY - JOUR JF - jsci JO - VL - 1372 IS - 5 PY - 1993 Y1 - 1993/3/01 TI - 1 TT - 1 N2 - 1 SP - 0 EP - 0 AD - KW - 1 UR - http://jsci.khu.ac.ir/article-1-1278-fa.html ER -