TY - JOUR JF - jsci JO - VL - 1374 IS - 8 PY - 1996 Y1 - 1996/6/01 TI - 7 TT - 7 N2 - 7 SP - 0 EP - 0 AD - KW - 7 UR - http://jsci.khu.ac.ir/article-1-1310-fa.html ER -