@article{1255629648,
author = {Berstein, I. and Ganea, T.},
title = {Homotopical nilpotency},
journal = {Illinois J. Math.},
volume = {5},
number = {1},
year = {1961},
pages = { 99-130},
language = {en},
url = {http://dml.mathdoc.fr/item/1255629648}
}
Berstein, I.; Ganea, T. Homotopical nilpotency. Illinois J. Math., Tome 5 (1961) no. 1, pp. 99-130. http://gdmltest.u-ga.fr/item/1255629648/