Geodesic
An infinitely smooth compact convex hypersurface with a shadow whose boundary is not twice-differentiable
Funkcionalʹnyj analiz i ego priloženiâ, Tome 23 (1989) no. 3, pp. 86-87.

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     author = {V. D. Sedykh},
     title = {An infinitely smooth compact convex hypersurface with a shadow whose boundary is not twice-differentiable},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
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V. D. Sedykh. An infinitely smooth compact convex hypersurface with a shadow whose boundary is not twice-differentiable. Funkcionalʹnyj analiz i ego priloženiâ, Tome 23 (1989) no. 3, pp. 86-87. http://geodesic.mathdoc.fr/item/FAA_1989_23_3_a20/

[1] Kiselman C.O., J. London Math. Soc., 33:1 (1986), 101–109 | DOI | MR | Zbl