@article{1255630890,
author = {Gruenberg, K. W.},
title = {The upper central series in soluble groups},
journal = {Illinois J. Math.},
volume = {5},
number = {1},
year = {1961},
pages = { 436-466},
language = {en},
url = {http://dml.mathdoc.fr/item/1255630890}
}
Gruenberg, K. W. The upper central series in soluble groups. Illinois J. Math., Tome 5 (1961) no. 1, pp. 436-466. http://gdmltest.u-ga.fr/item/1255630890/