%0 Journal Article
%A N. A. Izobov
%T On the existence of a linear Pfaffian system with a countable number of distinct characteristic sets of solutions
%J Differencialʹnye uravneniâ
%D 1998
%P 735-743
%V 34
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1998_34_6_a2/
%G ru
%F DE_1998_34_6_a2