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Moscow Tooling Institute. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 23, No. 3, pp. 86–87, July–September, 1989.
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Sedykh, V.D. An infinitely smooth compact convex hypersurface with a shadow whose boundary is not twice-differentiable. Funct Anal Its Appl 23, 246–248 (1989). https://doi.org/10.1007/BF01079542
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DOI: https://doi.org/10.1007/BF01079542