%0 Journal Article %A Ahmadian, M.T, Mojahedi, M, Moeenfard, H %T Free Vibration Analysis of a Nonlinear Beam Using Homotopy and Modified Lindstedt-Poincare Methods %J Journal of Solid Mechanics %V 1 %N 1 %P 29-36 %D 2009 %R %U https://sanad.iau.ir/fa/Article/908930