@article{INTG_1974_6_a5,
     author = {V. S. Malakhovskii and V. V. Makhorkin},
     title = {Differential geometry of manifolds of hyperquadrics in $n$-dimensional projective space},
     journal = {Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara},
     pages = {113--134},
     publisher = {mathdoc},
     volume = {6},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTG_1974_6_a5/}
}