@article{MZ_1956__65_169585,
     author = {Hanna Neumann},
     title = {On varieties of groups and their associated near-rings.},
     journal = {Mathematische Zeitschrift},
     pages = {36--69},
     publisher = {mathdoc},
     volume = {65},
     year = {1956},
     zbl = {0070.01905},
     url = {http://geodesic.mathdoc.fr/item/MZ_1956__65_169585/}
}