@article{BUMI_1947_3_2_3_a1,
     author = {Giuliano, Landolino},
     title = {Sulla formula $(\frac{dx}{ds})^2 + (\frac{dy}{ds})^2 = 1$},
     journal = {Bollettino della Unione matematica italiana},
     pages = {181--188},
     publisher = {mathdoc},
     volume = {Ser. 3, 2},
     number = {3},
     year = {1947},
     zbl = {0032.30702},
     language = {it},
     url = {http://geodesic.mathdoc.fr/item/BUMI_1947_3_2_3_a1/}
}