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@article{MZ_1968__103_170907, author = {Frank Levin}, title = {On {Some} {Varieties} of {Soluble} {Groups.} {II.}}, journal = {Mathematische Zeitschrift}, pages = {162--172}, publisher = {mathdoc}, volume = {103}, year = {1968}, zbl = {0155.04502}, url = {http://geodesic.mathdoc.fr/item/MZ_1968__103_170907/} }
Frank Levin. On Some Varieties of Soluble Groups. II.. Mathematische Zeitschrift, Tome 103 (1968), pp. 162-172. http://geodesic.mathdoc.fr/item/MZ_1968__103_170907/