%0 Journal Article
%A Kowalski, Oldřich
%A Vlášek, Zdeněk
%T On double-ruled hypersurfaces in $\bold R^4$
%J Commentationes Mathematicae Universitatis Carolinae
%D 1997
%P 407-411
%V 38
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMUC_1997__38_2_a22/
%G en
%F CMUC_1997__38_2_a22