@article{EJDE_2014__2014__a198,
     author = {Cheng,  Yi-Hsin and Wu,  Tsung-Fang},
     title = {Existence and multiplicity of positive solutions for indefinite semilinear elliptic problems in \(\mathbb {R^N\)}},
     journal = {Electronic journal of differential equations},
     year = {2014},
     volume = {2014},
     zbl = {1301.35015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2014__2014__a198/}
}