@article{1178244405,
author = {Hsu, Chen-ung},
title = {On some properties of $\pi $-structures on differentiable manifold},
journal = {Tohoku Math. J. (2)},
volume = {12},
number = {3},
year = {1960},
pages = { 429-454},
language = {en},
url = {http://dml.mathdoc.fr/item/1178244405}
}
Hsu, Chen-ung. On some properties of $\pi $-structures on differentiable manifold. Tohoku Math. J. (2), Tome 12 (1960) no. 3, pp. 429-454. http://gdmltest.u-ga.fr/item/1178244405/