@article{KUMEM_1995_3_a2,
     author = {\'Elie Cartan},
     title = {Les surfaces isotropes d'une quadrique de l'espace \`a 7~dimensions},
     journal = {In memoriam N. I. Lobatschevskii},
     pages = {10--94},
     publisher = {mathdoc},
     volume = {3},
     year = {1995},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/KUMEM_1995_3_a2/}
}