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In this setting, the closed-loop system exists for a canonical class of \"admissible\" feedbacks, and it inherits the absolute regularity and other properties of the given system. In particular, we can iterate feedbacks.<\/jats:p>","DOI":"10.1137\/s036301290139169x","type":"journal-article","created":{"date-parts":[[2003,6,11]],"date-time":"2003-06-11T11:12:06Z","timestamp":1055329926000},"page":"1141-1165","source":"Crossref","is-referenced-by-count":32,"title":["Feedbacks for Nonautonomous Regular Linear Systems"],"prefix":"10.1137","volume":"41","author":[{"given":"Roland","family":"Schnaubelt","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"351","published-online":{"date-parts":[[2006,7,26]]},"reference":[{"key":"R1","doi-asserted-by":"publisher","DOI":"10.1007\/s002459900111"},{"key":"R2","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-0348-9221-6"},{"key":"R3","volume-title":"Representation and control of infinite\u2010dimensional systems. 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Jacob,\n                      Time\u2010Varying Infinite Dimensional State\u2010Space Systems\n                      , Ph.D. thesis, Fachbereich Mathematik\/Informatik, Universit\u00e4t Bremen, Bremen, 1995."},{"key":"R13","unstructured":"B. Jacob,\n                      Optimal control of time\u2010varying well\u2010posed linear systems on a finite time horizon\n                      , in Mathematical Theory of Networks and Systems, Proceedings of the MTNS\u201398, A. Beghi, I. Finesso, and G. Picci, eds., Il Polografo, Padova, Italy, 1998, pp. 483\u2013486."},{"key":"R14","doi-asserted-by":"publisher","DOI":"10.1007\/BF01203385"},{"key":"R15","unstructured":"O. A. Ladyzenskaja, V. A. Solonnikov, and N. N. 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Stein,\n                      Singular Integrals and Differentiability Properties of Functions\n                      , Princeton University Press, Princeton, NJ, 1970."},{"key":"R27","doi-asserted-by":"publisher","DOI":"10.1007\/BF01351602"},{"key":"R28","doi-asserted-by":"publisher","DOI":"10.1007\/BF02788172"},{"key":"R29","doi-asserted-by":"publisher","DOI":"10.1137\/0327028"},{"key":"R30","unstructured":"George Weiss, The representation of regular linear systems on Hilbert spaces, Internat. Ser. Numer. 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