@article{GDZPPN002111403,
title = {Rigidity of integral curves of rank 2 distributions.},
journal = {Inventiones mathematicae},
volume = {114},
year = {1993},
pages = {435-462},
zbl = {0807.58007},
url = {http://dml.mathdoc.fr/item/GDZPPN002111403}
}
Bryant, Robert L.; Hsu, Lucas. Rigidity of integral curves of rank 2 distributions.. Inventiones mathematicae, Tome 114 (1993) pp. 435-462. http://gdmltest.u-ga.fr/item/GDZPPN002111403/