%0 Journal Article
%A M. Ya. Zhitomirskii
%T Degeneracies of differential 1-forms and Pfaffian structures
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1991
%P 53-90
%V 46
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1991_46_5_a1/
%G en
%F RM_1991_46_5_a1