Geodesic
On the critical parameter value for the higher sigma-exponent of linear differential systems
Differencialʹnye uravneniâ, Tome 42 (2006) no. 6, pp. 844-846 
E. K. Makarov. On the critical parameter value for the higher sigma-exponent of linear differential systems. Differencialʹnye uravneniâ, Tome 42 (2006) no. 6, pp. 844-846. http://geodesic.mathdoc.fr/item/DE_2006_42_6_a13/
@article{DE_2006_42_6_a13,
     author = {E. K. Makarov},
     title = {On the critical parameter value for the higher sigma-exponent of linear differential systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {844--846},
     year = {2006},
     volume = {42},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2006_42_6_a13/}
}
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