@article{ASUO_2004_XII_2_a17,
     author = {M. Sofonea and A. Matei },
     title = {A mixed variational formulation for the {Signorini
}                            frictionless problem in viscoplasticity},
     journal = {Analele Universit\u{a}\c{t}ii "Ovidius" Constan\c{t}a Seria Matematic\u{a}},
     publisher = {mathdoc},
     volume = {XII},
     number = {2},
     year = {2004},
     url = {http://geodesic.mathdoc.fr/item/ASUO_2004_XII_2_a17/}
}