Voice666
13-10-10, 20:12
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6T0P-511K3WK-1&_user=10&_coverDate=09/16/2010&_rdoc=1&_fmt=high&_orig=search&_origin=search&_sort=d&_docanchor=&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=5523cefaa7c5dd64bf50eecea70288d0&searchtype=a