@article{SM_1992_72_1_a10,
     author = {V. K. Beloshapka},
     title = {On holomorphic transformations of a~quadric},
     journal = {Sbornik. Mathematics},
     pages = {189--205},
     year = {1992},
     volume = {72},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1992_72_1_a10/}
}