@article{CM_1935__1__115_0,
     author = {Levi-Civita, T.},
     title = {Terne di congruenze sopra una superficie ed estensione della trigonometria},
     journal = {Compositio Mathematica},
     pages = {115--162},
     publisher = {Johnson Reprint Corporation},
     volume = {1},
     year = {1935},
     zbl = {0008.41103},
     language = {it},
     url = {http://www.numdam.org/item/CM_1935__1__115_0/}
}