TY  - JOUR
AU  - Sun, Juntao
AU  - Chu, Jifeng
TI  - Necessary and sufficient conditions for the existence of periodic solution to singular problems with impulses
JO  - Electronic Journal of Differential Equations
PY  - 2014
VL  - 2014
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/EJDE_2014__2014__a138/
LA  - en
ID  - EJDE_2014__2014__a138
ER  -