TY - JOUR AU - Liu, Yuji AU - Ge, Weigao TI - Positive solutions of boundary value problems for $2m$-order differential equations JO - Electronic Journal of Differential Equations PY - 2003 VL - 2003 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/EJDE_2003__2003__a169/ LA - en ID - EJDE_2003__2003__a169 ER -