Geodesic
On the theory of stability of ordinary differential systems and Pfaffian systems
Differencialʹnye uravneniâ, Tome 19 (1983) no. 5, pp. 782-789 
È. I. Grudo. On the theory of stability of ordinary differential systems and Pfaffian systems. Differencialʹnye uravneniâ, Tome 19 (1983) no. 5, pp. 782-789. http://geodesic.mathdoc.fr/item/DE_1983_19_5_a2/
@article{DE_1983_19_5_a2,
     author = {\`E. I. Grudo},
     title = {On the theory of stability of ordinary differential systems and {Pfaffian} systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {782--789},
     year = {1983},
     volume = {19},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1983_19_5_a2/}
}
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