@article{GDZPPN002203685,
title = {Multiplicity of solutions of nonlinear boundary value problems with nonlinearities crossing several higher eigenvalues.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {372},
year = {1986},
pages = {184-200},
zbl = {0588.35036},
url = {http://dml.mathdoc.fr/item/GDZPPN002203685}
}
McKenna, P.J.; Lazer, A.C. Multiplicity of solutions of nonlinear boundary value problems with nonlinearities crossing several higher eigenvalues.. Journal für die reine und angewandte Mathematik, Tome 372 (1986) pp. 184-200. http://gdmltest.u-ga.fr/item/GDZPPN002203685/