%0 Journal Article
%A Tromba, A. J.
%T Almost-Riemannian Structures on Banach Manifolds: The Morse Lemma and the Darboux Theorem
%J Canadian journal of mathematics
%D 1976
%P 640-652
%V 28
%N 3
%U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1976-064-x/
%R 10.4153/CJM-1976-064-x
%F 10_4153_CJM_1976_064_x