@article{JRAM_1940__182_150087,
     author = {P. Hall},
     title = {Verbal and marginal subgroups.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {156--157},
     publisher = {mathdoc},
     volume = {182},
     year = {1940},
     zbl = {0023.29902},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1940__182_150087/}
}