Journal of Computational and Applied Mathematics
A multiple shift -step for structured rank matrices☆
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The research of the first two authors, was partially supported by the Research Council K.U.Leuven, project OT/ 05/40 (Large rank structured matrix computations), CoE EF/ 05/006 Optimization in Engineering (OPTEC), by the Fund for Scientific Research–Flanders (Belgium), G.0455.0 (RHPH: Riemann–Hilbert problems, random matrices and Padé-Hermite approximation), G.0423.05 (RAM: Rational modelling: optimal conditioning and stable algorithms), and by the Interuniversity Attraction Poles Programme, initiated by the Belgian State, Science Policy Office, Belgian Network DYSCO (Dynamical Systems, Control, and Optimization). The first author has a grant as “Postdoctoraal Onderzoeker” from the Fund for Scientific Research–Flanders (Belgium). The work of the third author was partially supported by MIUR, grant number 2004015437. The scientific responsibility rests with the authors.