@article{MZ_1933__37_168475,
     author = {E. Cartan},
     title = {Observations sur le m\'emoire pr\'ec\'edent.},
     journal = {Mathematische Zeitschrift},
     pages = {619--622},
     publisher = {mathdoc},
     volume = {37},
     year = {1933},
     zbl = {0007.23101},
     url = {http://geodesic.mathdoc.fr/item/MZ_1933__37_168475/}
}