[1] Shigley, J.E., "Mechanical Engineering Design", 5th Edition, McGraw-Hill, New York, (2003).
[2] Hertz, H., "On the Contact of Elastic Solids", J. Reine Angew, Math. Vol. 92, pp. 156-171, (1882).
[3] Shoita, I., and Miyamoto, Y., "Functionaly Graded Materials", Japan, Elsevier, Septamber, (1996).
[4] Guler, M.A., "Contact Mechanics of FGM Coating, Ph.D. Thesis, Department of Mechanical Engineering", University of Lehigh, (2000).
[5] Giannakopoulos, A.E., Suresh, S., and Alcala, J., "Spherical Indentation of Compositionally Graded Materials: Theory and Experiments", Acta Mater, Vol. 45, pp. 1307-1321, (1997).
[6] Giannakopoulos, A.E., and Suresh, S., "Indentation of Solids with Gradients in Elastic Properties: PartI. Point Force Solution", International Journal of Solids and Structures, Vol. 34, pp. 2357-2392, (1997).
[7] Giannakopoulos, A.E., and Suresh, S., "Indentation of Solids with Gradients in Elastic Properties: Part II. Axisymetric Indenters", International Journal of Solids and Structures, Vol. 34, pp. 2392-2428, (1997).
[8] Guler, M A., and Erdogan, F., "Contact Mechanics of Graded Coatings", International Journal of Solids and Structures, Vol. 41, pp. 3865-3889, (2004).
[9] Ke, L.L., and Wang, Y.S., "Two-dimensional Contact Mechanics of Functionally Graded Materials with Arbitrary Spatial Variations of Material Properties", International Journal of Solids and Structures, Vol. 43, pp. 5779-5798, (2006).
[10] Ke, L.L., and Wang, Y.S., "Two-dimensional Soliding Frictional Contact of Functionally Graded Materials," European Journal of Mechanics A/Solids, Vol. 26, pp. 171-188, (2007).
[11] Huang, G.Y., Wang, Y.S., and Gross, D., "Fracture Analysis of a Functionally Graded Coating: Plane Deformation", European Journal of Mechanics A/Solids, Vol. 22, pp. 535-544, (2003).
[12] Huang, G.Y., Wang, Y.S., and Yu, S.W., "Fracture Analysis of a Functionally Graded in Interfacial Zone under Plane Deformation", International Journal of Solids and Structures, Vol. 41, pp. 731-743, (2004).
[13] Liu, T.J., and Wang, Y.S., "Axisymmetric Frictionless Contact Problem of a Functionally Graded Coating with Exponentially Varying Modulus", Acta Mechanica, Vol. 199, pp. 151-165, (2008).
[14] Liu, T.J., Wang, Y.S., and Zhang, C., "Axisymmetric Frictionless Contact of Functionally Graded Materials", Archive of Applied Mechanics, Vol. 78, pp. 267-282, (2008).
[15] Thimoshenko, S., and Goodier, J.N., "Theory of Elasticity", 2nd Edition, McGraw-Hill, New York, (1951).
[16] Erdogan, F., and Gupta, G.D., "On the Numerical Solution of Singular Integral Equations", Quarterly of Applied Mathematics, Vol. 29, pp. 525-534, (1972).
[17] ANSYS V10.0, user’s Manual, Houston Swanson Analysis System Inc., (2005).
[18] James, E., Shackelford, F., and Alexander, W., "Mechanical Properties of Materials", Materials Science and Engineering Handbook, Boca Ration: CRC Press LLC, (2001).