@article{700274,
     title = {Some global bifurcation problems for variational inequalities},
     booktitle = {Proceedings of Equadiff 9},
     series = {GDML\_Books},
     publisher = {Masaryk University},
     address = {Brno},
     year = {1998},
     pages = {97-113},
     url = {http://dml.mathdoc.fr/item/700274}
}

Le, Vy Khoi; Schmitt, Klaus. Some global bifurcation problems for variational inequalities, dans Proceedings of Equadiff 9, GDML_Books,  (1998), pp. 97-113. http://gdmltest.u-ga.fr/item/700274/