@article{GDZPPN002419025,
title = {The Lower Central Series of a Join of Subnormal Subgroups.},
journal = {Mathematische Zeitschrift},
volume = {154},
year = {1977},
pages = {85-90},
zbl = {0334.20017},
url = {http://dml.mathdoc.fr/item/GDZPPN002419025}
}
Lennox, J.C.; Segal, D.; Stonehewer, S. The Lower Central Series of a Join of Subnormal Subgroups.. Mathematische Zeitschrift, Tome 154 (1977) pp. 85-90. http://gdmltest.u-ga.fr/item/GDZPPN002419025/