@article{RSMUP_1960__30__281_0,
     author = {Predonzan, Arno},
     title = {Sugli spazi doppi},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {281--287},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {30},
     year = {1960},
     mrnumber = {146720},
     zbl = {0097.15302},
     language = {it},
     url = {http://www.numdam.org/item/RSMUP_1960__30__281_0/}
}