@article{CMH_1940__13_138767,
     author = {Alexandre Ostrowski},
     title = {Sur une classe de transformations diff\'erentielles dans l'espace \`a trois dimensions. {I.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {156--194},
     publisher = {mathdoc},
     volume = {13},
     year = {1940},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/CMH_1940__13_138767/}
}