Geodesic
Decreasing perturbations that preserve the characteristic vectors of linear systems
Differencialʹnye uravneniâ, Tome 30 (1994) no. 2, pp. 213-220 
O. P. Stepanovich. Decreasing perturbations that preserve the characteristic vectors of linear systems. Differencialʹnye uravneniâ, Tome 30 (1994) no. 2, pp. 213-220. http://geodesic.mathdoc.fr/item/DE_1994_30_2_a3/
@article{DE_1994_30_2_a3,
     author = {O. P. Stepanovich},
     title = {Decreasing perturbations that preserve the characteristic vectors of linear systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {213--220},
     year = {1994},
     volume = {30},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1994_30_2_a3/}
}
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