@article{CM_1935__2__424_0,
     author = {Tonolo, Angelo},
     title = {Il teorema dei seni per i triangoli infinitesimi tracciati sopra una superficie},
     journal = {Compositio Mathematica},
     pages = {424--437},
     publisher = {Johnson Reprint Corporation},
     volume = {2},
     year = {1935},
     zbl = {0012.31302},
     language = {it},
     url = {http://www.numdam.org/item/CM_1935__2__424_0/}
}