%0 Journal Article
%A N. A. Izobov
%T On the existence of linear Pfaffian systems whose set of lower characteristic vectors has a positive plane measure
%J Differencialʹnye uravneniâ
%D 1997
%P 1623-1630
%V 33
%N 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1997_33_12_a5/
%G ru
%F DE_1997_33_12_a5