@article{FORUM_1991__3_2_186408,
     author = {J.C. BEIDLEMAN and D.J.S. ROBINSON},
     title = {On the {Structure} of the {Normal} {Subgroups} of a {Group:} {Nilpotency.}},
     journal = {Forum mathematicum},
     pages = {581--594},
     publisher = {mathdoc},
     volume = {3},
     number = {2},
     year = {1991},
     zbl = {0759.20011},
     url = {http://geodesic.mathdoc.fr/item/FORUM_1991__3_2_186408/}
}