%0 Journal Article
%A Robert L. Bryant
%T On the Convex Pfaff–Darboux Theorem of Ekeland and Nirenberg
%J Symmetry, integrability and geometry: methods and applications
%D 2023
%V 19
%U http://geodesic.mathdoc.fr/item/SIGMA_2023_19_a59/
%G en
%F SIGMA_2023_19_a59