TY - JOUR AU - Yuji Liu TI - Periodic solutions of fourth-order functional differential equations with $p$-Laplacian JO - Kragujevac Journal of Mathematics PY - 2009 SP - 61 EP - 73 VL - 32 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/KJM_2009_32_1_a5/ ID - KJM_2009_32_1_a5 ER -