%0 Journal Article
%A K. A. Shramov
%T Birational Rigidity and $\mathbb Q$-Factoriality of a Singular Double Cover of a Quadric  Branched over a Divisor of Degree~4
%J Matematičeskie zametki
%D 2008
%P 300-311
%V 84
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_2008_84_2_a10/
%G ru
%F MZM_2008_84_2_a10