@article{DAN_1981_259_5_a9,
     author = {V. I. Kerchman},
     title = {Extremal properties of the contact boundary in {Signorini{\textquoteright}s} problem for a half-space},
     journal = {Doklady Akademii Nauk},
     pages = {1064--1068},
     publisher = {mathdoc},
     volume = {259},
     number = {5},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_259_5_a9/}
}