@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/}
}