TY  - JOUR
AU  - Gao, Haiyin
AU  - Weng, Shiyou
AU  - Jiang, Daqing
AU  - Hou, Xuezhang
TI  - On second order periodic boundary-value problems with upper and lower solutions in the reversed order
JO  - Electronic Journal of Differential Equations
PY  - 2006
VL  - 2006
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/EJDE_2006__2006__a191/
LA  - en
ID  - EJDE_2006__2006__a191
ER  -