TY - JOUR AU - Fei, Guihua TI - Nontrivial periodic solutions of asymptotically linear Hamiltonian systems JO - Electronic Journal of Differential Equations PY - 2001 VL - 2001 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/EJDE_2001__2001__a114/ LA - en ID - EJDE_2001__2001__a114 ER -