1. Gakhov, F.D., Kraevye zadachi (Boundary Value
Problems), Moscow: Nauka, 1977.
2. Muskhelishvili, N.I., Singulyarnye integral’nye
uravneniya (Singular Integral Equations), Moscow: Nauka,
1968.
3. Bitsadze, A.V., Kraevye zadachi dlya ellipticheskikh uravnenii vtorogo
poryadka (Boundary Value Problems for Second-Order Elliptic Equations), Moscow:
Nauka, 1968.
4. Soldatov, A.P., Funktsii, analiticheskie po Duglisu
(Douglis-Analytic Functions), Belgorod: Belgorod. Gos. Univ., 2016.
5. Soldatov, A.P., Hyperanalytic functions and their applications, Modern Math. Appl., 2004, vol. 15,
pp. 142–199.