%0 Journal Article %A Yang, Dandan %A Zhu, Hongbo %A Bai, Chuanzhi %T Positive solutions for semipositone fourth-order two-point boundary value problems %J Electronic Journal of Differential Equations %D 2007 %V 2007 %I mathdoc %U http://geodesic.mathdoc.fr/item/EJDE_2007__2007__a83/ %G en %F EJDE_2007__2007__a83