@article{RSMUP_1982__67__105_0,
     author = {Busetto, Giorgio},
     title = {Sottogruppi normali e proiettivit\`a},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {105--110},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {67},
     year = {1982},
     mrnumber = {682704},
     language = {it},
     url = {http://archive.numdam.org/item/RSMUP_1982__67__105_0/}
}