RT - Journal Article T1 - Extended Abstract  JF - serd YR - 2014 JO - serd VO - 3 IS - 9 UR - http://serd.khu.ac.ir/article-1-2836-fa.html SP - 165 EP - 180 AB - LA eng UL http://serd.khu.ac.ir/article-1-2836-fa.html M3 ER -