Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MAN_1970__187_162027, author = {D. FERUS}, title = {On the {Type} {Number} of {Hypersurfaces} in {Spaces} of {Constant} {Curvature.}}, journal = {Mathematische Annalen}, pages = {310--316}, publisher = {mathdoc}, volume = {187}, year = {1970}, zbl = {0187.19202}, url = {http://geodesic.mathdoc.fr/item/MAN_1970__187_162027/} }
D. FERUS. On the Type Number of Hypersurfaces in Spaces of Constant Curvature.. Mathematische Annalen, Tome 187 (1970), pp. 310-316. http://geodesic.mathdoc.fr/item/MAN_1970__187_162027/