@article{GDZPPN002204835,
title = {Bifurcation points and eigenvalues of inequalities of reaction-diffusion type.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {374},
year = {1987},
pages = {1-13},
zbl = {0617.35053},
url = {http://dml.mathdoc.fr/item/GDZPPN002204835}
}
Quittner, Pavol. Bifurcation points and eigenvalues of inequalities of reaction-diffusion type.. Journal für die reine und angewandte Mathematik, Tome 374 (1987) pp. 1-13. http://gdmltest.u-ga.fr/item/GDZPPN002204835/