@article{1256052381,
author = {Porter, Gerald J.},
title = {Homomorphisms of principal fibrations: Applications to classification, induced fibrations, and the extension problem},
journal = {Illinois J. Math.},
volume = {16},
number = {1},
year = {1972},
pages = { 41-60},
language = {en},
url = {http://dml.mathdoc.fr/item/1256052381}
}
Porter, Gerald J. Homomorphisms of principal fibrations: Applications to classification, induced fibrations, and the extension problem. Illinois J. Math., Tome 16 (1972) no. 1, pp. 41-60. http://gdmltest.u-ga.fr/item/1256052381/