@article{700163,
     title = {Stability and bifurcation problems for reaction-diffusion systems with unilateral conditions},
     booktitle = {Equadiff 6},
     series = {GDML\_Books},
     publisher = {J. E. Purkyn\v e University, Department of Mathematics},
     address = {Brno},
     year = {1986},
     pages = {227-234},
     mrnumber = {MR0877129},
     zbl = {0643.35050},
     url = {http://dml.mathdoc.fr/item/700163}
}

Kučera, Milan. Stability and bifurcation problems for reaction-diffusion systems with unilateral conditions, dans Equadiff 6, GDML_Books,  (1986), pp. 227-234. http://gdmltest.u-ga.fr/item/700163/