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Research supported in part by Komitet Badan Naukowych (Committee of Scientific Research), grant number 2005 92 03.
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Doliwka, K. On five points in the boundary of a plane convex body pairwise in at least unit relative distances. J Geom 53, 76–78 (1995). https://doi.org/10.1007/BF01224041
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DOI: https://doi.org/10.1007/BF01224041