@article{GDZPPN00240737X,
title = {The Derived Series of a Join of Subnormal Sugroups.},
journal = {Mathematische Zeitschrift},
volume = {114},
year = {1970},
pages = {57-69},
zbl = {0224.20034},
url = {http://dml.mathdoc.fr/item/GDZPPN00240737X}
}
Roseblade, James E. The Derived Series of a Join of Subnormal Sugroups.. Mathematische Zeitschrift, Tome 114 (1970) pp. 57-69. http://gdmltest.u-ga.fr/item/GDZPPN00240737X/