RT - Journal Article T1 - Article -2 JF - USWR YR - 2012 JO - USWR VO - 1 IS - 1 UR - http://ptj.uswr.ac.ir/article-1-25-en.html SP - 17 EP - 21 AB - LA eng UL http://ptj.uswr.ac.ir/article-1-25-en.html M3 ER -