@article{1183522993,
author = {Hermann, Robert},
title = {Secondary obstructions for fibre spaces},
journal = {Bull. Amer. Math. Soc.},
volume = {65},
number = {6},
year = {1959},
pages = { 5-8},
language = {en},
url = {http://dml.mathdoc.fr/item/1183522993}
}
Hermann, Robert. Secondary obstructions for fibre spaces. Bull. Amer. Math. Soc., Tome 65 (1959) no. 6, pp. 5-8. http://gdmltest.u-ga.fr/item/1183522993/