@article{700364,
     title = {A multiplicity theorem for the Neumann problem for nonlinear hemivariational inequalities},
     booktitle = {Equadiff 10},
     series = {GDML\_Books},
     publisher = {Masaryk University},
     address = {Brno},
     year = {2002},
     pages = {327-337},
     url = {http://dml.mathdoc.fr/item/700364}
}

Papageorgiou, Nikolaos S.; Smyrlis, George. A multiplicity theorem for the Neumann problem for nonlinear hemivariational inequalities, dans Equadiff 10, GDML_Books,  (2002), pp. 327-337. http://gdmltest.u-ga.fr/item/700364/