@article{SM_1998_189_1_a4,
     author = {M. M. Grinenko},
     title = {Birational automorphisms of a~three-dimensional  double quadric with an~elementary singularity},
     journal = {Sbornik. Mathematics},
     pages = {97--114},
     publisher = {mathdoc},
     volume = {189},
     number = {1},
     year = {1998},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1998_189_1_a4/}
}