%0 Journal Article
%A H. Freudenthal
%T The connections between the $E_7$-geometry and the configuration of the 28 double tangents to the curve of order~4
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1976
%P 62-66
%V 31
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1976_31_5_a5/
%G en
%F RM_1976_31_5_a5