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The paper has been written while the second author was a fellow of the Alexander von Humboldt-Foundation, to which she expresses her thanks
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Clausing, A., Papadopoulou, S. Stable convex sets and extremal operators. Math. Ann. 231, 193–203 (1978). https://doi.org/10.1007/BF01420240
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DOI: https://doi.org/10.1007/BF01420240