@article{RSMUP_1999__101__19_0,
     author = {De Giovanni, Francesco and Russo, Alessio},
     title = {Groups with dense subnormal subgroups},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {19--27},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {101},
     year = {1999},
     mrnumber = {1705276},
     zbl = {0936.20023},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1999__101__19_0/}
}