1. V.M. Aleksandrov and E. V. Kovalenko, “On some class of integral equations arising inmixed boundary value problems of continuum mechanics,” Sov. Phys. Dokl. 25(2), 354–356 (1980) [in Russian].
2. V. M. Aleksandrov and E. V. Kovalenko, Problems in Continuum Mechanics with Mixed Boundary Conditions (Nauka, Moscow, 1986) [in Russian].
3. J. M. Appell, A. S. Kalitvin, and P. P. Zabrejko, Partially Integral Operators and Integro-Differential Equations (Marcel Dekker, New York, 2000).
4. Yu. Kh. Eshkabilov, “On the spectrum of tensor sum of the compact operators,” Uzb. Mat. Zh. 3, 104–112 (2005) [in Russian].
5. Yu. Kh. Eshkabilov, “Perturbation of the spectrum of the operator of multiplication to a function, with a partially integral operator,” Vestnik Nat. Uni. Uzb. 2, 17–21 (2006) [in Russian].