TY  - JOUR
AU  - Pan,  Lijun
TI  - Existence of periodic solutions for second order delay differential equations with impulses
JO  - Electronic journal of differential equations
PY  - 2011
VL  - 2011
UR  - http://geodesic.mathdoc.fr/item/EJDE_2011__2011__a57/
LA  - en
ID  - EJDE_2011__2011__a57
ER  -