Remarks about Signorini's problem in linear elasticity
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 8 (1981) no. 4, p. 605-645 
@article{ASNSP_1981_4_8_4_605_0,
     author = {Kinderlehrer, David},
     title = {Remarks about Signorini's problem in linear elasticity},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 8},
     number = {4},
     year = {1981},
     pages = {605-645},
     zbl = {0482.73017},
     mrnumber = {656002},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1981_4_8_4_605_0}
}

Kinderlehrer, David. Remarks about Signorini's problem in linear elasticity. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 8 (1981) no. 4, pp. 605-645. http://www.numdam.org/item/ASNSP_1981_4_8_4_605_0/

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