@article{JCA_1995_2_1-2_a15,
     author = {P. Oppezzi and A. M. Rossi},
     title = {Existence of {Solutions} for {Unilateral} {Problems} with {Multivalued} {Operators}},
     journal = {Journal of convex analysis},
     pages = {241--262},
     publisher = {mathdoc},
     volume = {2},
     number = {1-2},
     year = {1995},
     url = {http://geodesic.mathdoc.fr/item/JCA_1995_2_1-2_a15/}
}