@article{RSMUP_1992__87__139_0,
     author = {Beidleman, James C. and Robinson, Derek J. S.},
     title = {On the structure of the normal subgroups of a group : supersolubility},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {139--149},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {87},
     year = {1992},
     mrnumber = {1183906},
     zbl = {0811.20035},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1992__87__139_0/}
}