@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/