Geodesic
On localization of the characteristic numbers of real matrices
Matematičeskie zametki, Tome 15 (1974) no. 5, pp. 765-768.

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In this paper we give domains for the distribution on the complex plane of the characteristic numbers of a set of real matrices, basing our work on results obtained by F. I. Karpelevich for matrices with nonnegative elements. 
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     author = {Yu. A. Pykh},
     title = {On localization of the characteristic numbers of real matrices},
     journal = {Matemati\v{c}eskie zametki},
     pages = {765--768},
     publisher = {mathdoc},
     volume = {15},
     number = {5},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_15_5_a12/}
}
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Yu. A. Pykh. On localization of the characteristic numbers of real matrices. Matematičeskie zametki, Tome 15 (1974) no. 5, pp. 765-768. http://geodesic.mathdoc.fr/item/MZM_1974_15_5_a12/