@article{MAN_1928__99_159254,
     author = {L. Tonelli},
     title = {Su un problema di {Abel.}},
     journal = {Mathematische Annalen},
     pages = {183--199},
     publisher = {mathdoc},
     volume = {99},
     year = {1928},
     language = {it},
     url = {http://geodesic.mathdoc.fr/item/MAN_1928__99_159254/}
}