@article{RSMUP_1949__18__231_0,
     author = {Trevisan, Giorgio},
     title = {Su una questione di topologia},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {231--233},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {18},
     year = {1949},
     mrnumber = {33008},
     zbl = {0033.13201},
     language = {it},
     url = {http://www.numdam.org/item/RSMUP_1949__18__231_0/}
}