@article{MAN_1988__281_4_164441,
     author = {Djuiro G. De Figueiredo and Jean-Pierre Gossez},
     title = {Nonresonance {Below} the {First} {Eigenvalue} for a {Semilinear} {Elliptic} {Problem.}},
     journal = {Mathematische Annalen},
     pages = {589--610},
     publisher = {mathdoc},
     volume = {281},
     number = {4},
     year = {1988},
     zbl = {0637.35037},
     url = {http://geodesic.mathdoc.fr/item/MAN_1988__281_4_164441/}
}