On the existence of a linear Pfaffian system with a disconnected lower characteristic set of positive measure
Differencialʹnye uravneniâ, Tome 35 (1999) no. 1, pp. 65-71.

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     author = {N. A. Izobov and A. S. Platonov},
     title = {On the existence of a linear {Pfaffian} system with a disconnected lower characteristic set of positive measure},
     journal = {Differencialʹnye uravneni\^a},
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     number = {1},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1999_35_1_a9/}
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N. A. Izobov; A. S. Platonov. On the existence of a linear Pfaffian system with a disconnected lower characteristic set of positive measure. Differencialʹnye uravneniâ, Tome 35 (1999) no. 1, pp. 65-71. http://geodesic.mathdoc.fr/item/DE_1999_35_1_a9/