@article{MAN_1894__45_157740,
     author = {M.G. Humbert},
     title = {Sur la th\'eorie g\'en\'erale des surfaces unicursales},
     journal = {Mathematische Annalen},
     pages = {428--445},
     publisher = {mathdoc},
     volume = {45},
     year = {1894},
     zbl = {25.1227.02},
     url = {http://geodesic.mathdoc.fr/item/MAN_1894__45_157740/}
}