%0 Journal Article
%A K. A. Shramov
%T On the rationality of non-singular threefolds with a pencil of Del~Pezzo surfaces of degree~4
%J Sbornik. Mathematics
%D 2006
%P 127-137
%V 197
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_2006_197_1_a6/
%G en
%F SM_2006_197_1_a6