%0 Journal Article
%A V. A. Vassiliev
%T Geometry of local lacunae of hyperbolic operators with constant coefficients
%J Sbornik. Mathematics
%D 1993
%P 111-123
%V 75
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1993_75_1_a5/
%G en
%F SM_1993_75_1_a5