TY  - JOUR
AU  - V. D. Sedykh
TI  - An infinitely smooth compact convex hypersurface with a shadow whose boundary is not twice-differentiable
JO  - Funkcionalʹnyj analiz i ego priloženiâ
PY  - 1989
SP  - 86
EP  - 87
VL  - 23
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/FAA_1989_23_3_a20/
LA  - ru
ID  - FAA_1989_23_3_a20
ER  -