@article{SM_2009_200_11_a5,
     author = {E. V. Sharoiko},
     title = {Hassett-Tschinkel correspondence and automorphisms of the quadric},
     journal = {Sbornik. Mathematics},
     pages = {1715--1729},
     publisher = {mathdoc},
     volume = {200},
     number = {11},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2009_200_11_a5/}
}