1. Bogolyubov, N.N. and Mitropol’skii, Yu.A., Asimptoticheskie metody v teorii nelineinykh kolebanii (Asymptotic Methods in the Theory of Nonlinear Oscillations), Moscow: Nauka, 1974.
2. Pontryagin, L.S., Boltyanskii, V.G., Gamkrelidze, R.V., and Mishchenko, E.F., Matematicheskaya teoriya optimal’nykh protsessov (Mathematical Theory of Optimal Processes), Moscow: Nauka, 1974.
3. Kharitonov, V.L., On Asymptotical Stability of the Equilibrium of the Systems of Linear Differential Equations, Diff. Uravn., 1978, vol. 11, pp. 2086–2088.
4. Matveev, A.S., Theory of Optimal Control in the Works of V.A. Yakubovich, Avtom. Telemekh., 2006, no. 10, pp. 120–174.
5. Gusev, S.V. and Likhtarnikov, A.L., Kalman-Popov-Yakubovich Lemma and the S-procedure: A Historical Essay, Avtom. Telemekh., 2006, no. 11, pp. 77–121.