1. Vavakin, A.S. and Salganik, R.L., Effective Elastic Characteristics of Bodies with Isolated Cracks, Cavities, and Rigid Inhomogeneities, Izv. Akad. Nauk SSSR, Mekh. Tverd. Tela, 1978, vol. 2, pp. 95–107.
2. Goldin, S.V., Seismicheskie volny v anizotropnykh sredakh (Seismic Waves in Anisotropic Media), Novosibirsk: Izd. Sib. Otd. Ross. Akad. Nauk, 2008.
3. Lebedev, V.I., Difference Analogs of Orthogonal Expansions, Basic Differential Operators for Some Boundary-Value Problems of Mathematical Physics, I, Zh. Vych. Mat. Mat. Fiz., 1964, vol. 4, no. 3, pp. 449–465.
4. Lisitsa, V.V., Optimal Grids for Solving the Wave Equation with Variable Coefficients, Sib. Zh. Vych. Mat., 2005, vol. 8, no. 3, pp. 219–229.
5. Shokin, Yu.I. and Yanenko, N.N., Metod differentsial’nogo priblizheniya. Primenenie k gazovoi dinamike (Method of the Differential Approximation. Applications in Fluid Dynamics), Novosibirsk: Nauka (1985).