@article{ZNSL_1983_132_a19,
     author = {E. V. Schelkanova},
     title = {On the prolongation of the geometries of quadratic spaces},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {178--181},
     year = {1983},
     volume = {132},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1983_132_a19/}
}