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Bellman, R.: Matrix Analysis. New York: McGraw-Hill 1960.
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Communicated by A. Ostrowski
The work of the second author was supported in part by Grants of the National Science Foundation and of the Deutsche Forschungsgemeinschaft.
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Taussky, O., Wielandt, H. On the matrix function Ax+X′A′. Arch. Rational Mech. Anal. 9, 93–96 (1962). https://doi.org/10.1007/BF00253335
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DOI: https://doi.org/10.1007/BF00253335