TY  - JOUR
AU  - Li, Yongjin
TI  - Existence of periodic solutions for second-order neutral differential equations
JO  - Electronic Journal of Differential Equations
PY  - 2005
VL  - 2005
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/EJDE_2005__2005__a275/
LA  - en
ID  - EJDE_2005__2005__a275
ER  -