@article{01345012,
title = {On the enumerable set of different characteristic sets of solutions of a Pfaffian linear system.},
journal = {Memoirs on Differential Equations and Mathematical Physics},
volume = {15},
year = {1998},
pages = {153-156},
zbl = {0935.35016},
language = {en},
url = {http://dml.mathdoc.fr/item/01345012}
}
Izobov, N. On the enumerable set of different characteristic sets of solutions of a Pfaffian linear system.. Memoirs on Differential Equations and Mathematical Physics, Tome 15 (1998) pp. 153-156. http://gdmltest.u-ga.fr/item/01345012/