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@article{MZ_1967__98_170744, author = {M.F. Newman and Peter M. Neumann}, title = {On {Schreier} {Varieties} of {Groups.}}, journal = {Mathematische Zeitschrift}, pages = {196--199}, publisher = {mathdoc}, volume = {98}, year = {1967}, zbl = {0152.00302}, url = {http://geodesic.mathdoc.fr/item/MZ_1967__98_170744/} }
M.F. Newman; Peter M. Neumann. On Schreier Varieties of Groups.. Mathematische Zeitschrift, Tome 98 (1967), pp. 196-199. http://geodesic.mathdoc.fr/item/MZ_1967__98_170744/