Geodesic
Necessary and sufficient conditions for sign stability of matrices
Doklady Akademii Nauk, Tome 264 (1982) no. 3, pp. 542-546.

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     author = {D. O. Logofet and N. B. Ul'yanov},
     title = {Necessary and sufficient conditions for sign stability of matrices},
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     year = {1982},
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     url = {http://geodesic.mathdoc.fr/item/DAN_1982_264_3_a5/}
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D. O. Logofet; N. B. Ul'yanov. Necessary and sufficient conditions for sign stability of matrices. Doklady Akademii Nauk, Tome 264 (1982) no. 3, pp. 542-546. http://geodesic.mathdoc.fr/item/DAN_1982_264_3_a5/