1. Likov, A.V., Mikhailov, Y.A.: The Theory of Heat and Mass Transfer. Qosenergaizdat, Moscow (1963) (Russian)
2. Agranovich, M.S.: Spectral properties of diffraction problems. In: Voitovich, N.N., Kazenelenbaum, B.Z., Sivov, A.N. (eds.) Generalized Method of Eigenoscillations in the Theory of Diffraction. Nauka, Moscow (1977)
3. Yakubov, S., Yakubov, Y.: Differential-Operator Equation Ordinary and Partial Differential Equation. Chapman & Hall/CRC, Boca Raton (1999)
4. Shakhmurov, V.B.: Linear and nonlinear abstract elliptic equations with VMO coefficients and applications. Fixed Point Theory Appl. 2013, 6 (2013)
5. Rasulov, M.L.: Methods of Contour Integration. Nort-Holland, Amsterdam (1967)