%0 Journal Article
%A U. STERZ
%A K. DRECHSLER
%T Contact Conditions on Conic Varieties and Halphen's 2nd Formula
%J Beiträge zur Algebra und Geometrie
%D 1992
%P 55-70
%V 33
%I mathdoc
%U http://geodesic.mathdoc.fr/item/BAG_1992__33_138503/
%F BAG_1992__33_138503