[1] E. N. DANCER: 
On the structure of solutions of non-linear eigenvalue problems. Ind. Univ. Math. J. 23 (1974), 1069-1076. 
MR 0348567 | 
Zbl 0276.47051 
[2] G. DUVANT J.-L. LIONS: 
Les inéquations en méchanique et en physique. Dunod, Paris 1972. 
MR 0464857 
[3] S. FUČÍK A. KUFNER: 
Nonlinear differencial equations. Elsevier, Scient. Publ. Comp., Amsterdam - Oxford - New York 1980. 
MR 0558764 
[4] P. DRÁBEK M. KUČERA M. MÍKOVÁ: 
Bifurcation points of reaction-diffusion systems with unilateral conditions. Czechoslovak Math. J. 35 (1985), 639-660. 
MR 0809047 
[5] P. DRÁBEK M. KUČERA: 
Eigenvalues of inequalities of reaction-diffusion type and destabilizing effect of unilateral conditions. Czechoslovak Math. J. 36 (1986). 
MR 0822872 
[6] P. DRÁBEK M. KUČERA: 
Reaction-diffusion systems: Destabilizing effect of unilateral conditions. To appear. 
MR 0969497 
[7] M. KUČERA: 
A new method for obtaining eigenvalues of variational inequalities based on bifurcation theory. Čas. pěst. mat. 104 (1979), 389-411. 
MR 0553173 
[8] M. KUČERA: 
A new method for obtaining eigenvalues of variational inequalities. Operators with multiple eigenvalues. Czechoslovak Math. J. 32 (107) (1982), 197-207. 
MR 0654056 
[9] M. KUČERA: Bifurcation points of inequalities of reactiondiffusion type. To appear.
[10] M. MIMURA Y. NISHIURA M. YAMAGUTI: 
Some diffusive prey and predator systems and their bifurcation problems. Ann. New York Acad. Sci 316 (1979), 490-510. 
MR 0556853 
[11] Y. NISHIURA: 
Global structure of bifurcating solutions of some reaction-diffusion systems. SIAM J. Math. Anal. Vol. 13, No. 4, July 1982, 555-593. 
MR 0661590 | 
Zbl 0505.76103