[1] P. Drábek M. Kučera:
Eigenvalues of inequalities of reaction-diffusion type and destabilizing effect of unilateral conditions. Czechoslovak Math. J. 36 (1986), 116-130.
DOI 10.21136/CMJ.1986.102072 |
MR 0822872
[2] P. Quittner:
Bifurcation points and eigenvalues of inequalities of reaction-diffusion type. J. reine angew. Math, 380 (1987), 1-13.
MR 0916198 |
Zbl 0617.35053