@article{BSMF_1939__67__S101_0,
     author = {Levi-Civita},
     title = {La trigonom\'etrie des petits triangles curvilignes sur une surface},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {101--134},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {67},
     year = {1939},
     doi = {10.24033/bsmf.1307},
     language = {fr},
     url = {http://www.numdam.org/articles/10.24033/bsmf.1307/}
}