@article{GDZPPN002420260,
title = {Elliptic Equations with Noninvertible Fredholm Linear Part and Bounded Nonlinearities.},
journal = {Mathematische Zeitschrift},
volume = {162},
year = {1978},
pages = {179-194},
zbl = {0368.35032},
url = {http://dml.mathdoc.fr/item/GDZPPN002420260}
}
Amann, H.; Ambrosett, A.; Mancini, G. Elliptic Equations with Noninvertible Fredholm Linear Part and Bounded Nonlinearities.. Mathematische Zeitschrift, Tome 162 (1978) pp. 179-194. http://gdmltest.u-ga.fr/item/GDZPPN002420260/