TY  - JOUR
AU  - Li, Qiang
AU  - Li, Yongxiang
TI  - Existence and multiplicity of positive periodic solutions for second-order functional differential equations with infinite delay
JO  - Electronic Journal of Differential Equations
PY  - 2014
VL  - 2014
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/EJDE_2014__2014__a178/
LA  - en
ID  - EJDE_2014__2014__a178
ER  -