Geodesic
On the existence of a linear Pfaffian system with a countable number of distinct characteristic sets of solutions
Differencialʹnye uravneniâ, Tome 34 (1998) no. 6, pp. 735-743 
N. A. Izobov. On the existence of a linear Pfaffian system with a countable number of distinct characteristic sets of solutions. Differencialʹnye uravneniâ, Tome 34 (1998) no. 6, pp. 735-743. http://geodesic.mathdoc.fr/item/DE_1998_34_6_a2/
@article{DE_1998_34_6_a2,
     author = {N. A. Izobov},
     title = {On the existence of a linear {Pfaffian} system with a countable number of distinct characteristic sets of solutions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {735--743},
     year = {1998},
     volume = {34},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1998_34_6_a2/}
}
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