@article{MM2_1989__63_3_155381,
     author = {Rainer Schumann},
     title = {Regularity for {Signorini's} {Problem} in linear eleasticity.},
     journal = {Manuscripta mathematica},
     pages = {255--292},
     publisher = {mathdoc},
     volume = {63},
     number = {3},
     year = {1989},
     zbl = {0692.73076},
     url = {http://geodesic.mathdoc.fr/item/MM2_1989__63_3_155381/}
}