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@article{MZ_1964__85_170314, author = {James Wiegold and Peter M. Neumann}, title = {Schreier varieties of groups.}, journal = {Mathematische Zeitschrift}, pages = {392--400}, publisher = {mathdoc}, volume = {85}, year = {1964}, zbl = {0126.26901}, url = {http://geodesic.mathdoc.fr/item/MZ_1964__85_170314/} }
James Wiegold; Peter M. Neumann. Schreier varieties of groups.. Mathematische Zeitschrift, Tome 85 (1964), pp. 392-400. http://geodesic.mathdoc.fr/item/MZ_1964__85_170314/