TY  - JOUR
AU  - Tromba, A. J.
TI  - Almost-Riemannian Structures on Banach Manifolds: The Morse Lemma and the Darboux Theorem
JO  - Canadian journal of mathematics
PY  - 1976
SP  - 640
EP  - 652
VL  - 28
IS  - 3
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1976-064-x/
DO  - 10.4153/CJM-1976-064-x
ID  - 10_4153_CJM_1976_064_x
ER  -