1. M. Abramowitz and I. Stegun (eds.), Handbook of Mathematical Functions, Dover, New York (1964).
2. A. N. Guz and Yu. N. Nemish, Boundary-Shape Perturbation Method in Continuum Mechanics [in Russian], Vyshcha Shkola, Kyiv (1989).
3. A. N. Guz and Yu. N. Nemish, Perturbation Methods in Three-Dimensional Problems of Elasticity [in Russian], Vyshcha Shkola, Kyiv (1982).
4. V. H. Kauderer, Nonlinear Mechanics [in German], Springer-Verlag, Berlin (1958).
5. S. G. Lekhnitskii, Torsion of Anisotropic and Inhomogeneous Rods [in Russian], Nauka, Moscow (1971).