求小信号建模的文章,大家帮帮忙啊!

我想找一篇文章,可是我的学校没有这个权限,郁闷,大家能否帮我找一下这篇文章啊.Yang,E.Lee,F.C.,Jovanovic,M.M.,"Extended Describing Fuction Technique Applied to the Modeling of Resonant Converters",Proceedings of the Virginia Power Electronics Center Seminar, Blacksburg, VA,1991,PP.179-191.我的信箱zhangfengjiu1@sina.com直接传到这个上面也行.