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Hammer, R. Beziehungen zwischen den Sätzen von Radon, Helly und Caratheodory bei axiomatischen Konvexitäten. Abh.Math.Semin.Univ.Hambg. 46, 3–24 (1977). https://doi.org/10.1007/BF02993012
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DOI: https://doi.org/10.1007/BF02993012