@article{CMH_1945__18_138865,
     author = {Francesco Severi},
     title = {Le funzioni periodiche di pi\`u variabili.},
     journal = {Commentarii mathematici Helvetici},
     pages = {16--29},
     publisher = {mathdoc},
     volume = {18},
     year = {1945},
     language = {it},
     url = {http://geodesic.mathdoc.fr/item/CMH_1945__18_138865/}
}