@article{PORMA_1982__41_1-4_115505,
     author = {Biroli, Marco},
     title = {Existence of regular solutions for nonlinear {Signorini's} problem},
     journal = {Portugaliae mathematica},
     pages = {333--338},
     publisher = {mathdoc},
     volume = {41},
     number = {1-4},
     year = {1982},
     mrnumber = {0766861},
     zbl = {0545.49003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1982__41_1-4_115505/}
}