@article{BUMI_1954_3_9_4_a14,
     author = {Tenca, Luigi},
     title = {Una particolare elica sferica.},
     journal = {Bollettino della Unione matematica italiana},
     pages = {451--454},
     publisher = {mathdoc},
     volume = {Ser. 3, 9},
     number = {4},
     year = {1954},
     zbl = {0056.40201},
     mrnumber = {65976},
     language = {it},
     url = {http://geodesic.mathdoc.fr/item/BUMI_1954_3_9_4_a14/}
}