@article{CMH_1929__1_138519,
     author = {F. Gonseth},
     title = {Sur la g\'eom\'etrie des imaginaries. {I.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {142--155},
     publisher = {mathdoc},
     volume = {1},
     year = {1929},
     zbl = {55.0353.04},
     url = {http://geodesic.mathdoc.fr/item/CMH_1929__1_138519/}
}