@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/