@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/