Geodesic
On a small variation of the characteristic indices of a regular linear system
Differencialʹnye uravneniâ, Tome 21 (1985) no. 5, pp. 901-903 
A. V. Lasunsky. On a small variation of the characteristic indices of a regular linear system. Differencialʹnye uravneniâ, Tome 21 (1985) no. 5, pp. 901-903. http://geodesic.mathdoc.fr/item/DE_1985_21_5_a25/
@article{DE_1985_21_5_a25,
     author = {A. V. Lasunsky},
     title = {On a small variation of the characteristic indices of a regular linear system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {901--903},
     year = {1985},
     volume = {21},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1985_21_5_a25/}
}
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