%0 Journal Article %A Shang, Xudong %T Multiplicity theorems for semipositone $p$-Laplacian problems %J Electronic Journal of Differential Equations %D 2011 %V 2011 %I mathdoc %U http://geodesic.mathdoc.fr/item/EJDE_2011__2011__a7/ %G en %F EJDE_2011__2011__a7