%0 Journal Article %A Yuji Liu %T Periodic solutions of fourth-order functional differential equations with $p$-Laplacian %J Kragujevac Journal of Mathematics %D 2009 %P 61 - 73 %V 32 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/KJM_2009_32_1_a5/ %F KJM_2009_32_1_a5