@article{1240434247,
author = {KOBAYASHI, Kazuaki and TSUKUI., Yasuyuki},
title = {The ball coverings of manifolds},
journal = {J. Math. Soc. Japan},
volume = {28},
number = {4},
year = {1976},
pages = { 133-143},
language = {en},
url = {http://dml.mathdoc.fr/item/1240434247}
}
KOBAYASHI, Kazuaki; TSUKUI., Yasuyuki. The ball coverings of manifolds. J. Math. Soc. Japan, Tome 28 (1976) no. 4, pp. 133-143. http://gdmltest.u-ga.fr/item/1240434247/