1. Manitius, A.Z. and Olbrot, A.W., Finite Spectrum Assignment Problem for Systems with Delays, IEEE Trans. Automat. Control, 1979, no. 4, pp. 541–553.
2. Krasovskii, N.N. and Osipov, Yu.S., On the Stabilization of the Motion of a Controlled Object with a Delay in the Control System, Izv. Akad. Nauk SSSR Tekhn. Kibern., 1963, vol. 6, pp. 3–15.
3. Osipov, Yu.S., On Stabilization of Control Systems with Delay, Differ. Uravn., 1965, vol. 1, no. 5, pp. 605–618.
4. Bhat, K.P. and Koivo, H.N., Model Characterization of Controllability and Observability of Time-Delay Systems, IEEE Trans. Automat. Control, 1976, no. 2, pp. 292–293.
5. Marchenko, V.M., On the Controllability of Linear Systems with Delay, Dokl. Akad. Nauk SSSR, 1977, vol. 236, no. 5, pp. 1083–1086.