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@article{MZ_1965__89_170423, author = {Derek S. Robinson}, title = {On the theory of subnormal subgroups.}, journal = {Mathematische Zeitschrift}, pages = {30--51}, publisher = {mathdoc}, volume = {89}, year = {1965}, zbl = {0134.26004}, url = {http://geodesic.mathdoc.fr/item/MZ_1965__89_170423/} }
Derek S. Robinson. On the theory of subnormal subgroups.. Mathematische Zeitschrift, Tome 89 (1965), pp. 30-51. http://geodesic.mathdoc.fr/item/MZ_1965__89_170423/