TY  - JOUR
AU  - H. Freudenthal
TI  - The connections between the $E_7$-geometry and the configuration of the 28 double tangents to the curve of order~4
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1976
SP  - 62
EP  - 66
VL  - 31
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1976_31_5_a5/
LA  - en
ID  - RM_1976_31_5_a5
ER  -