On the existence of a linear Pfaffian system with an arbitrary countable lower characteristic set
Differencialʹnye uravneniâ, Tome 35 (1999) no. 10, pp. 1382-1386.

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     author = {A. S. Platonov},
     title = {On the existence of a linear {Pfaffian} system with an arbitrary countable lower characteristic set},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1382--1386},
     publisher = {mathdoc},
     volume = {35},
     number = {10},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1999_35_10_a10/}
}
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A. S. Platonov. On the existence of a linear Pfaffian system with an arbitrary countable lower characteristic set. Differencialʹnye uravneniâ, Tome 35 (1999) no. 10, pp. 1382-1386. http://geodesic.mathdoc.fr/item/DE_1999_35_10_a10/