به ادرسهای زیر مراجعه کنید
http://www.sciencedirect.com/science/article/pii/S0040403912003887
http://www.google.com/url?q=http://journal.kcsnet.or.kr/main/j_search/j_download.htm%3Fcode%3DB021129&sa=U&ei=8L6AUbmdGcjJ4ATF1IHoCQ&ved=0CCMQFjAD&usg=AFQjCNEUuMBzxH-bXKarUIFquVdfVuvZGg...