@article{MAN_1978__238_163182,
     author = {Jens Frehse},
     title = {Landesman-Lazer-Alternative {Theorems} for a {Class} of {Nonlinear} {Functional} {Equations.}},
     journal = {Mathematische Annalen},
     pages = {59--66},
     publisher = {mathdoc},
     volume = {238},
     year = {1978},
     zbl = {0372.47032},
     url = {http://geodesic.mathdoc.fr/item/MAN_1978__238_163182/}
}