@article{GDZPPN002086603, title = {Fields of Tangent k-Planes on Manifolds.}, journal = {Inventiones mathematicae}, volume = {4}, year = {1967}, pages = {334-347}, zbl = {0162.55402}, url = {http://dml.mathdoc.fr/item/GDZPPN002086603} }
THOMAS, E. Fields of Tangent k-Planes on Manifolds.. Inventiones mathematicae, Tome 4 (1967) pp. 334-347. http://gdmltest.u-ga.fr/item/GDZPPN002086603/