1. Pokrovskii, A.V., Existence and Computation of Stable Modes in Relay Systems, Autom. Remote Control, 1986, vol. 47, no. 4, part 1, pp. 451–458.
2. Yevstafyeva, V.V. and Kamachkin, A.M., Control of Dynamics of a Hysteresis System with an External Disturbance, Vestn. S.-Peterburg. Univ., Ser. 10, Prikl. Mat., Informat., Protsessy Upravlen., 2004, no. 2, pp. 101–109.
3. Yevstafyeva, V.V., On Necessary Conditions for Existence of Periodic Solutions in a Dynamic System with Discontinuous Nonlinearity and an External Periodic Influence, Ufa Math. J., 2011, vol. 3, no. 2, pp. 19–26.
4. Potapov, D.K., Control of Spectral Problems for Equations with Discontinuous Operators, Tr. IMM UrO RAN, 2011, vol. 17, no. 1, pp. 190–200.
5. Potapov, D.K., Existence of Solution to Control Problems with Perturbations for a Class of Equations with Spectral Parameter and Discontinuous Operator, Vestn. Voronezh. Gos. Univ., Ser. Sist. Anal. Inform. Tekhnol., 2012, no. 1, pp. 12–15.