@article{BUMI_1931_1_10_2_a2,
     author = {Cattaneo, Paolo},
     title = {Sui sistemi birombici},
     journal = {Bollettino della Unione matematica italiana},
     pages = {63--67},
     publisher = {mathdoc},
     volume = {Ser. 1, 10},
     number = {2},
     year = {1931},
     zbl = {0001.29202},
     language = {it},
     url = {http://geodesic.mathdoc.fr/item/BUMI_1931_1_10_2_a2/}
}