@article{bwmeta1.element.bwnjournal-article-fmv135i1p11bwm,
author = {B. Wehrfritz},
title = {The upper central series of some matrix groups},
journal = {Fundamenta Mathematicae},
volume = {134},
year = {1990},
pages = {111-126},
zbl = {0752.20024},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-fmv135i1p11bwm}
}
Wehrfritz, B. The upper central series of some matrix groups. Fundamenta Mathematicae, Tome 134 (1990) pp. 111-126. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-fmv135i1p11bwm/