TY  - JOUR
AU  - Zhao, Chenglong
AU  - Yuan, Yanyan
AU  - Liu, Yansheng
TI  - A necessary and sufficient condition for the existence of positive solutions to singular boundary-value problems of higher order differential equations
JO  - Electronic Journal of Differential Equations
PY  - 2006
VL  - 2006
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/EJDE_2006__2006__a69/
LA  - en
ID  - EJDE_2006__2006__a69
ER  -