1. Ballard, P., Jarušek, J.: Indentation of an elastic half-space by a rigid flat punch as a model problem for analysing contact problems with coulomb friction. J. Elast. 103, 15–52 (2011)
2. Duvaut, G., Lions, J.L.: Les Inéquations en Mécanique et en Physique. Dunod, Paris (1972)
3. Monographs & Textbooks in Pure & Appl. Math.;C. Eck,2005
4. Eringen, A.C., Şuhubi, E.S.: Elastodynamics. Volume II, Linear Theory. Academic Press, New York (1975)
5. Galin, L.A.: Contact problems in the theory of elasticity, Moscow (1953). English translation by H. Moss, North Carolina State College, Department of Mathematics (1961)