Almost A ( m o d β ) - invariant subspaces
Analyse des systèmes, Astérisque, no. 75-76 (1980), pp. 239-248. 
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     author = {Willems, Jan C.},
     title = {Almost $A(mod \beta)-$ invariant subspaces},
     booktitle = {Analyse des syst\`emes},
     series = {Ast\'erisque},
     pages = {239--248},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {75-76},
     year = {1980},
     mrnumber = {581719},
     zbl = {0459.93029},
     language = {en},
     url = {http://archive.numdam.org/item/AST_1980__75-76__239_0/}
}
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Willems, Jan C. Almost $A(mod \beta)-$ invariant subspaces, dans Analyse des systèmes, Astérisque, no. 75-76 (1980), pp. 239-248. http://archive.numdam.org/item/AST_1980__75-76__239_0/

[1] W. M. Wonham.- Linear multivariable control : A geometric approach, Second Edition, Springer-Verlag (1979). | MR

[2] J. C. Willems.- Almost A ( m o d β ) - invariant subspaces : an approach to high-gain feedback design. Submitted to the IEEE Transactions on Automatic Control. | Zbl

[3] J. C. Willems. - Topological classification and structural stability of linear systems, Journal of Differential Equations, Vol. 35 (1980). | DOI | MR | Zbl