@article{MZ_1968__107_171067,
     author = {Derek J.S. Robinson},
     title = {A {Property} of the {Lower} {Central} {Series} of a {Group.}},
     journal = {Mathematische Zeitschrift},
     pages = {225--231},
     publisher = {mathdoc},
     volume = {107},
     year = {1968},
     zbl = {0167.02202},
     url = {http://geodesic.mathdoc.fr/item/MZ_1968__107_171067/}
}