1. Lyapunov, A., Problème général de la stabilité du mouvement, Ann. Math. Studies, 1949, vol. 17, Princeton Univ. Press, USA.
2. Andreev, Yu.N., Upravlenie konechnomernymi lineinymi ob”ektami (Control of Finite-dimensional Linear Objects), Moscow: Nauka, 1976.
3. Antoulas, A.C., Approximation of Large-Scale Dynamical Systems, Philadelphia: SIAM, 2005.
4. Sorensen, D.C. and Antoulas, A.C., Gramians of Structured Systems and an Error Bound for Structure-Preserving Model Reduction, in Lecture Notes in Computational Science and Engineering, vol. 45, Benner, P., Mehrmann V., and Sorensen D., Eds., Berlin: Springer-Verlag, 2005, pp. 117–130.
5. Polyak, B.T. and Shcherbakov, P.S., Robastnaya ustoichivost’ i upravlenie (Robust Stability and Control), Moscow: Nauka, 2002.