1. F. R. Gantmacher, The Theory of Matrices (Chelsea, New York, 1959; Fizmatgiz, Moscow, 1967).
2. The Theory of Systems with Variable Structure, Ed. by S. V. Emel’yanov (Nauka, Moscow, 1970) [in Russian].
3. S. K. Korovin and V. V. Fomichev, State Observers for Linear Systems with Uncertainty (Fizmatlit, Moscow, 2007; Walter de Gruyter, Berlin, 2009).
4. N. N. Krasovskii, Some Problems of the Stability Theory of Motion (Fizmatgiz, Moscow, 1959) [in Russian].
5. S. A. Minyuk, Observability of Linear Systems with Aftereffect (Grodno, 1983).