A generalization of Signorini's perturbation method suggested by two problems of Grioli
Rendiconti del Seminario Matematico della Università di Padova, Tome 68 (1982), pp. 149-162. 
@article{RSMUP_1982__68__149_0,
     author = {Capriz, G. and Podio-Guidugli, P.},
     title = {A generalization of {Signorini's} perturbation method suggested by two problems of {Grioli}},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {149--162},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {68},
     year = {1982},
     mrnumber = {702153},
     zbl = {0509.73016},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1982__68__149_0/}
}
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Capriz, G.; Podio-Guidugli, P. A generalization of Signorini's perturbation method suggested by two problems of Grioli. Rendiconti del Seminario Matematico della Università di Padova, Tome 68 (1982), pp. 149-162. http://www.numdam.org/item/RSMUP_1982__68__149_0/

[1] G. Capriz - P. PODIO-GUIDUGLI, The role of Fredholm conditions in Signorini's perturbation method, Arch. Rat. Mech. An., 70 (1979), pp. 261-288. | MR | Zbl

[2] G. Capriz - P. Podio-Guidugli, Duality and stability questions for the linearized traction problem with live loads in elasticity, Proc. IUTAM Symposium on Stability, Nümbrecht (1981), pp. 70-78. | Zbl

[3] C. Truesdell - W. Noll, The Non-linear Field Theories of Mechanics, PH III/3, S. Flügge Ed., Berlin - Heidelberg - New York, Springer, 1965. | MR | Zbl