TY  - JOUR
AU  - Kwong, Man Kam
AU  - Wong, James S.W.
TI  - An optimal existence theorem for positive solutions of a four-point boundary value problem
JO  - Electronic Journal of Differential Equations
PY  - 2009
VL  - 2009
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/EJDE_2009__2009__a77/
LA  - en
ID  - EJDE_2009__2009__a77
ER  -