TY - JOUR AU - Pan, Lijun TI - Periodic solutions for $n$-th order delay differential equations with damping terms JO - Archivum mathematicum PY - 2011 SP - 263 EP - 278 VL - 47 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/ARM_2011__47_4_a3/ LA - en ID - ARM_2011__47_4_a3 ER -