@article{MZ_1978__158_172630,
     author = {H. Amann and A. Ambrosett and G. Mancini},
     title = {Elliptic {Equations} with {Noninvertible} {Fredholm} {Linear} {Part} and {Bounded} {Nonlinearities.}},
     journal = {Mathematische Zeitschrift},
     pages = {179--194},
     publisher = {mathdoc},
     volume = {158},
     year = {1978},
     zbl = {0368.35032},
     url = {http://geodesic.mathdoc.fr/item/MZ_1978__158_172630/}
}