Geodesic
The $D$-stability problem for $4\times 4$ real matrices
Archivum mathematicum, Tome 41 (2005) no. 4, pp. 439-450.

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We give detailed discussion of a procedure for determining the robust $D$-stability of a $4\times 4$ real matrix. The procedure begins from the Hurwitz stability criterion. The procedure is applied to two numerical examples.
Classification : 15A04, 15A18, 34D15, 65F15, 93D09
Keywords: diagonal stability; Cauchy indices 
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     title = {The $D$-stability problem for $4\times 4$ real matrices},
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Impram, Serkan T.; Johnson, Russell; Pavani, Raffaella. The $D$-stability problem for $4\times 4$ real matrices. Archivum mathematicum, Tome 41 (2005) no. 4, pp. 439-450. http://geodesic.mathdoc.fr/item/ARM_2005__41_4_a7/