1. M. Wonham, Linear Multivariable Control Systems: a Geometric Approach [Russian translation], Nauka, Moscow (1980).
2. H. F. Sussman, ?Minimal realization and canonical forms for bilinear systems,? J. Franklin Inst.,301, No. 6, 593?604 (1976).
3. S. G. Krein, Linear Differential Equations in a Banach Space [in Russian], Nauka, Moscow (1967).
4. S. A. Belikov and S. N. Samborskii, ?Domains of attainability for systems described by partial differential equations,? Sib. Mat. Zh.,24, No. 4, 3?12 (1983).
5. P. I. Dudnikov and S. N. Samborskii, Closed Subsets in a Banach Space, Preprint Akad. Nauk UkrSSR Inst. Mat. 81.49, Kiev (1981), pp. 19?21.