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@article{IM_1993__114_1_144154, author = {Robert L. Bryant and Lucas Hsu}, title = {Rigidity of integral curves of rank 2 distributions.}, journal = {Inventiones mathematicae}, pages = {435--462}, publisher = {mathdoc}, volume = {114}, number = {1}, year = {1993}, zbl = {0807.58007}, url = {http://geodesic.mathdoc.fr/item/IM_1993__114_1_144154/} }
Robert L. Bryant; Lucas Hsu. Rigidity of integral curves of rank 2 distributions.. Inventiones mathematicae, Tome 114 (1993) no. 1, pp. 435-462. http://geodesic.mathdoc.fr/item/IM_1993__114_1_144154/