@article{MAN_1937__114_159930,
     author = {B.H. Neumann},
     title = {Identical relations in groups. {I.}},
     journal = {Mathematische Annalen},
     pages = {506--525},
     publisher = {mathdoc},
     volume = {114},
     year = {1937},
     zbl = {0016.35102},
     url = {http://geodesic.mathdoc.fr/item/MAN_1937__114_159930/}
}