1. Iskandarov, S. (1998). On the influence of Volterra integral perturbations on the boundedness of solutions of linear differential equations. Vestn. KGNU. Ser. Est.-Tekh. Nauki, 1, 83–87 (in Russian).
2. Iskandarov, S. (2008). Asymptotic stability of two classes of integro-differential second-order Volterra equations. Diff. Uravn., 44(7), 883–895 https://doi.org/10.1134/s0012266108070033.
3. Imanaliev, M. I., & Ved’, Yu. A. (1973). Integral perturbations in the theory of stability of systems of differential equations. In: Studies of Integro-Differential Equations in the Kyrgyz Republic, Issue 9, Ilim, Frunze, pp. 3–67 (in Russian).
4. Iskandarov, S. (2002). The Method of Weight and Cutting Functions and Asymptotic Properties of Solutions of Integro-Differential and Integral Volterra-Type Equations. Ilim, Bishkek (in Russian).
5. Iskandarov, S. (2006). On the method of reduction to a system for a linear Volterra integro-differential secondorder equation. In: Studies of Integro-Differential Equations, Issue 35, Ilim, Bishkek, pp. 31–35 (in Russian).