1. Popov G.Ia., Izvestija vuzov. Serija: Stroitel’stvo i arhitektura (11-12), 11–19 (1959)
2. Miyamoto Y. et al., Functionally Graded Materials: Design, Processing and Applications (Springer, New York, 2013)
3. Shiraki Y., Usami N. (eds), Silicon-Germanium (SiGe) Nanostructures: Production, Properties and Applications in Electronics (Woodhead Publishing, Cambridge, 2011)
4. On the method of orthogonal polynomials in contact problems of the theory of elasticity