1. I. G. Goryacheva and M. N. Dobychin, Contact Problems of Tribology (Mashinostroenie, Moscow, 1988) [in Russian].
2. N. I. Muskhelishvili, Singular Integral Equations (Moscow, 1962) [in Russian].
3. N. P. Vekua, Sets of Singular Integral Equations (Moscow, 1970) [in Russian].
4. F. D. Gakhov, Boundary-Value Problems (Moscow, 1977) [in Russian].
5. B. Nobl, Wiener–Hopf Method (Moscow, 1962) [in Russian].