1. Bulgakov, B.V., On Accumulation of Disturbances in Linear Oscillatory Systems with Constant Parameters, Dokl. Akad. Nauk SSSR, 1946, vol. 5, no. 5, pp. 339–342.
2. Gnoenskii, L.S., The Bulgakov Problem on Accumulation of Disturbances, in The Bulgakov Problem on the Maximum Deviation and Its Applications, Aleklsandrov, V.V., Ed., Moscow: Mosk. Gos. Univ., 1993.
3. Zhermolenko, V.N., Maximum Deviation of Second-Order Oscillation System Subjet to Exogenous and Parametric Disturbances, Izv. Ross. Akad. Nauk, Teor. Sist. Upravlen., 2007, no. 3, pp. 75–80.
4. Ulanov, G.M., Dinamicheskaya tochnost’ i kompensatsiya vozmushchenii v sistemakh avtomaticheskogo upravleniya (Dynamic Accuracy and Compensation of Disturbances in Automatic Control Systems), Moscow: Mashinostroenie, 1971.
5. Yakubovich, E.D., Solution of a Problem in the Optimal Control of a Discrete Linear Systems, Autom. Remote Control, 1975, vol. 36, no. 9, part 1, pp. 1447–1453.