@article{EJDE_2011__2011__a7,
     author = {Shang,  Xudong},
     title = {Multiplicity theorems for semipositone {\(p\)-Laplacian} problems},
     journal = {Electronic journal of differential equations},
     year = {2011},
     volume = {2011},
     zbl = {1219.35117},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2011__2011__a7/}
}