@article{10_21136_CMJ_1955_100150,
     author = {Palaj, Cyril},
     title = {L'invariant $\Theta\sb {n+1}$ comme un invariant simultan\'e fondamental d'une jusqu'\`a $n+1$ hyperquadriques dans l'espace \`a $n$ dimensions},
     journal = {Czechoslovak Mathematical Journal},
     pages = {345--354},
     publisher = {mathdoc},
     volume = {05},
     number = {3},
     year = {1955},
     doi = {10.21136/CMJ.1955.100150},
     mrnumber = {0077957},
     zbl = {0068.33803},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1955.100150/}
}