TY  - JOUR
AU  - Thomas Vogel
TI  - Existence of Engel structures
JO  - Annals of mathematics
PY  - 2009
SP  - 79
EP  - 137
VL  - 169
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4007/annals.2009.169.79/
DO  - 10.4007/annals.2009.169.79
LA  - en
ID  - 10_4007_annals_2009_169_79
ER  -