[1] M. Š. Birman, M. Z. Solomyak: Asymptotic behavior of the spectrum of weakly polar integral operators. Izv. Akad. Nauk. SSSR, Ser. Mat. Tom 34 (1970), N$^0$5, 1151–1168.
[2] F. Cobos, T. Kühn:
Eigenvalues of weakly singular integral operators. J. London Math. Soc. (2) 41 (1990), 323–335.
MR 1067272
[3] M. Dostanić:
An estimation of singular of convolution operators. Proc. Amer. Math. Soc. 123 (1995), N$^0$5, 1399–1409.
MR 1246522
[4] I. C. Gohberg, M. G. Krein:
Introduction to the Theory of Linear Nonselfadjoint Operators, in “Translation of Math. monographs” Vol. 18. Amer. Math. Soc., Providence, R.I., 1969.
MR 0246142
[6] G. P. Kostometov:
Asymptotic behavior of the spectrum of integral operators with a singularity on the diagonal. Math. USSR Sb. T 94 (136) N$^0$3 (7), 1974, pp. 445–451.
MR 0361935
[7] S. G. Mihlin: Lectures on Mathematics Physics. Moscow, 1968.
[10] M. Rosenblat:
Some results on the asymptotic behavior of eigenvalues for a class of integral equations with translations kernels. J. Math. Mech. 12 (1963), 619–628.
MR 0150551
[11] S. Y. Rotfeld:
Asymptotic of the spectrum of abstract integral operators. Trudy. Moscow Mat. Obšč. T. 34 (1977), 105–128.
MR 0461221
[12] S. G. Samko, A. A. Kilbas, O. I. Maricev: Fractional Integrals and Derivative and Some Applications. Minsk, 1987.