@article{MAN_1903__57_158088,
     author = {Ernesto Pascal},
     title = {Eugenio {Beltrami.}},
     journal = {Mathematische Annalen},
     pages = {65--107},
     year = {1903},
     volume = {57},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1903__57_158088/}
}